https://doi.org/10.5812/ijhrba.112404

Family Structure in Association with Alcohol Use Among Adolescents: A Systematic Review and Meta-analysis

authors:

avatar Zahra Pourmovahed ORCID 1 , avatar Seyed Saeed Mazloomy Mahmoodabad ORCID 2 , avatar Seyed Mojtaba Yassini Ardekani ORCID 3 , avatar Hassan Zareei Mahmoodabadi 4 , avatar Hossein Tavangar 1 , avatar Mojtaba Kaviani 5 , avatar Amin Salehi-Abargouei ORCID 6 , avatar Nour-Mohammad Bakhshani ORCID 7 , avatar Shahab-Aldin Akbarian ORCID 6 , *

Department of Nursing Education, Research Center for Nursing and Midwifery Care, Shahid Sadoughi University of Medical Sciences, Yazd, IR Iran
Social Determinants of Health Research Center, Department of Health Education & Promotion, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, IR Iran
Department of Psychology, Research Center of Addiction and Behavioral Sciences, Shahid Sadoughi University of Medical Sciences, Yazd, IR Iran
Department of Education and Psychology, Yazd University, Yazd, IR Iran
Faculty of Pure & Applied Science, School of Nutrition and Dietetics, Acadia University, Wolfville, Nova Scotia, Canada
Nutrition and Food Security Research Center, Department of Nutrition, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, IR Iran
Department of Clinical Psychology, Children and Adolescent Health Research Center, Zahedan University of Medical Sciences, Zahedan, IR Iran
International Journal of High Risk Behaviors and Addiction: Vol.11, issue 1; e112404
published online: December 7, 2021
article type: Systematic Review
received: January 23, 2021
revised: October 19, 2021
accepted: October 20, 2021

How To Cite Pourmovahed Z, Mazloomy Mahmoodabad S S, Yassini Ardekani S M, Zareei Mahmoodabadi H, Tavangar H , et al. Family Structure in Association with Alcohol Use Among Adolescents: A Systematic Review and Meta-analysis. Int J High Risk Behav Addict. 2022;11(1):e112404. https://doi.org/10.5812/ijhrba.112404.

Abstract

Context:

It is proposed that family structure influences adolescent alcohol use; however, the findings are mixed, and no systematic review has been conducted to summarize the evidence.

Objectives:

We aimed to identify the association between family structures and adolescent alcohol consumption through a systematic review and meta-analysis of observational studies.

Methods:

PubMed, Scopus, and Google Scholar were searched until June 2017 for observational studies, which examined the relationship between family structure and adolescent alcohol use. A random-effects model was used to derive the overall odds ratio (OR) for the likelihood of alcohol use in different non-intact families compared with intact families (adolescents growing up with both biological parents). DerSimonian and Liard's random-effects model was used to conduct the meta-analysis. All analyses were performed using STATA software, version 11.2.

Results:

Fifty-seven articles met the eligibility criteria for the systematic review, and 29 were included in the meta-analysis. The meta-analysis revealed a significant increase in alcohol use among adolescents with non-intact families (OR = 1.27, 95% confidence interval: 1.19, 1.36) compared with adolescents with intact families in which both biological parents were present. Living with one biological parent, living in a divorced family, loss of parents, and other types of the non-intact family also significantly increased the odds of alcohol use in adolescents (P < 0.05).

Conclusions:

All types of the non-intact family were linked to adolescents' alcohol use. The family structure could have an essential role in reducing high-risk behaviors, including alcohol use and its consequences in adolescents.

1. Context

Adolescence is recognized as a critical and transitional period for developing adaptive behaviors (1). This period is characterized by rapid physical, psychological, cognitive, and sociocultural changes, coinciding with many threats to health, called risky behaviors (2). The risky behaviors might have harmful and lasting consequences during this period (3).

Adolescents' alcohol use is risky behavior that has become a public health issue. It is proposed that adolescents' alcohol consumption might be associated with other conditions, including mental health problems (such as emotional instability, depression, and suicide), risky sexual behaviors (4, 5), delinquency (4, 6), poor academic performance (7), maladaptive behavior, violence, accidents, and social exclusion (7, 8). Early alcohol use predicts future drinking patterns (9), contributing to long-term health consequences (9, 10). It is revealed that more than 70% of European students consumed alcohol at least once (11, 12). Almost half of all students drink alcohol by 13 years of age or before, while this proportion varies across countries (11, 13).

During adolescence, which can be considered a transitional period, families might support adolescents to adapt to social and emotional changes, including searching for identity, seeking independence, influencing by friends, and communicating (14). It is reported that adolescents whose parents were separated had poorer health and were more likely to smoke (14). Furthermore, lower health quality of life, particularly higher emotional and behavioral problems, might occur in non-nuclear family structures (15). In this regard, traditional nuclear families (intact families) in which both the biological father and mother are present appear to be better for this purpose (16, 17). It is also proposed that parental divorce has a persistent influence on adolescents, increasing the probability of alcohol use and drunkenness more than other elements such as poor socioeconomic position and low parental support (18, 19).

Recently, researchers have attempted to identify the influence of family processes on the patterns of alcohol use in adolescents. It would be necessary to identify the types of family structure and their relations to alcohol consumption (18, 20). However, studies have led to inconsistent results when examining the association between family structure and alcohol use in adolescents. For instance, it is revealed by some studies that adolescents living in broken families desire to use alcohol earlier and drink more hazardously (21, 22). It is also found that adolescents living with both biological parents were involved less repeatedly in high-risk behaviors, including alcohol consumption (23), than those living in other families with different structures. However, other studies have indicated no relationship between family structure and adolescent deviant behavior expressions (24, 25). Parental divorce is associated with a relative change in subjective well-being. The effect of divorce on subjective well-being is partially mediated by paternal absence (26). In contrast, family instability could lead to a broad spectrum of negative consequences, including poor economic status and behavioral problems in children (27).

2. Objectives

To the best of our knowledge, no systematic review has been published regarding the association between family structure and the likelihood of alcohol use by adolescents. Therefore, this study aimed to manage a systematic review and meta-analysis of observational studies and summarize the published evidence regarding the relationship between family structure and the likelihood of alcohol use among adolescents. Thus, this paper explores the effect of different family structures on alcohol consumption in adolescents to show how some factors may explain differences in alcohol drinking according to family type.

3. Methods

The current systematic review is reported based on PRISMA guidelines (http://www.prismastatement.org). The study protocol was also registered in the International Prospective Register of Systematic Reviews (http://www.crd.york.ac.uk/PROSPERO, registry code: CRD42017054484).

3.1. Search Strategy

We conducted a systematic search through published literature in Scopus, PubMed, and Google Scholar from 1986 up to 30 June 2017 to find relevant studies. The MeSH and non-MeSH keywords used for online search were "family structure", "single parents", "stepparents", "disengaged families", "engaged families", "enmeshed families", "under-organized families", "family communication", "undifferentiated families", "problem solving", "triangulation", "coalition", "parentified child", "life support", "family function", "family stability", "family support", "social support", "parent-child relationship", and "family roles" in combination with "alcoholism", "alcohol abuse", "alcohol drinking", "alcohol use", "alcohol consumption", "alcohol drinking patterns", "drunkenness", "alcohol drinking attitudes", and "alcohols", as well as "adolescent, "young adult", "adolescence", "teenager", "young people", "teen", "youth", "juvenile", and "adolescent health". No language or date restriction was used when searching the databases. Also, backward literature searching was done to identify references or works cited in the main articles in order to find more relevant papers.

3.2. Inclusion Criteria

Studies that mentioned family structures and any high-risk behavior in adolescents were selected to be further evaluated by reading their full texts. Adolescents were considered boys and girls between 11 and 25 years of age (28). In the next step, we selected the studies examining the association between any types of non-intact family structure and alcohol use in the adolescent population with cross-sectional and cohort designs, which reported odds ratios (OR) or risk ratios (RR). A non-intact family was defined as all kinds of family structure, except families where both biological parents were present. The different family structures and their definitions are summarized in Table 1. Alcohol use was also defined as the self-reported consumption of alcoholic beverages at least once a month (29). Studies were excluded if they investigated the association in other age groups.

Table 1.

Definitions Used for Intact and Different Types of Non-intact Family Structures

Family Structure DefinitionReferences
Intact (Two parents, Both parents, Both biological parents, Bi-nuclear parent)Both biological parents are present, and adolescents live together with their both biological parents in one household.(22, 30, 31)
Non-intact family Non-intact families included maternal, paternal, and no-parent families.(31)
Single parent (Separated single parent or Divorced)The adolescents’ parents did not live together anymore due to parental divorce or separation.(17, 22, 30, 32)
Single mother (mother only)Adolescents only live with their mothers. No stepfather is present.
Single father (father only)Adolescents only live with their fathers. No stepmother is present.
Mother and stepfatherAdolescents live with their biological mother and her new partner.
Father and stepmotherAdolescents live with their biological father and his new partner.
Loss of parentsNeither natural parents were present because of dying.(22)
Other types of non-intact familyNeither natural parents were present.(30, 32, 33)
Non-parent family home
Living with grandparents, aunts, uncles, cousins, siblings
Foster children

All titles and abstracts were reviewed independently by two authors (ZP and ASA) to identify eligible studies. Two independent authors carefully checked the full texts of the potentially relevant articles. Any discordances were resolved by discussion.

3.3. Data Extraction

The following information was extracted from the eligible studies: (1) first authors' family name; (2) publication year; (3) research location; (4) study design (cohort, cross-sectional); (5) sample size; (6) age and gender of participants; (7) types of family structure; and (8) odds ratios for the association between family structure and the likelihood of alcohol use in adolescents. All data were checked two times by ZP and ASA independently, and any disagreement in extracted data was resolved through discussion. The methodological quality was assessed using the Newcastle-Ottawa scale (Table 2) (34).

Table 2.

Newcastle Ottawa Scores

Cohort StudiesSelectionComparabilityOutcomeTotal Score, (9 Scores)
Study
Shucksmith, 1997 (29)**--*--*-4 stars
Blum, 2000 (35)***-*--*-5 stars
Kendler, 2002 (36)*-*-*--**5 stars
del Carmen, 2002 (37)*****-***8 stars
Seljamo, 2006 (38)******-**8 stars
Alati, 2010 (39)***-**-**7 stars
Jackson, 2016 (40)*-*-*****7 stars
Cross-sectional studies
Miller, 1997 (41)**-***-**7 stars
Hoffmann, 2017 (42)**-******8 stars
Boyle, 2001 (43)*****-**7 stars
McArdle, 2002 (44)**-***-**7 stars
Ledoux, 2002 (30)**-***-**7 stars
Eitle, 2005 (45)**-******8 stars
Wagner, 2008 (46)---*--**3 stars
Nikolakopoulos, 2008 (47)--------0 stars
Choquet, 2007 (48)**-******8 stars
Beebe, 2008 (49)---**-**4 stars
Wang, 2009 (50)**-******8 stars
Tomcikova, 2009 (18)*********9 stars
Brassai, 2009 (51)**-**-**6 stars
Mak, 2010 (31)*********9 stars
Habib, 2010 (52)**********10 stars
Small, 2014 (53)********8 stars
Ruutel, 2014 (19)******-***9 stars
Huang, 2015 (54)********8 stars
Tomcikova, 2015 (55)******-***9 stars
Barfield-Cottledge, 2011 (56)--******6 stars
Jacobs, 2016 (57)--******6 stars

3.4. Statistical Analysis

The Odds Ratio (OR) and its 95% Confidence Interval (95% CI) for the likelihood of alcohol use in participants with any non-intact families compared with those with intact families (living with both biological parents) were recorded to calculate the log OR and standard error used as the effect size for meta-analysis. If the ORs were not reported, we calculated the effect sizes from the number of participants with and without alcohol use based on family structure categories. For studies that did not report the total number of participants without intact families, we used the number of participants reported for each type of non-intact family structure (father-only, mother-only, etc.). Then the calculated effect sizes were used to compare children with and without intact families in the overall analysis. DerSimonian and Liard's random-effects model was used to conduct the meta-analysis (58) because its hypothesis considers between-study variability. The heterogeneity was checked using Cochran's Q test and I-squared (I2) (58). Sensitivity analysis was performed by excluding each study from the overall meta-analysis. The publication bias was assessed by the visual inspection of funnel plots and conducting Egger's regression and Begg's adjusted rank correlation tests (59). All analyses were performed using STATA software, version 11.2 (Stata Corp, College Station, TX). The CIs that did not include one were considered significant at P < 0.05.

4. Results

4.1. Search Result

After the systematic search through all databases, 8,493 articles were identified. In the initial phase, 8,128 unrelated papers were excluded after reading titles/abstracts because they did not explore the association between family structure and high-risk behavior or alcohol use. In total, 365 full texts were further checked to find the eligible articles. Most full-texts were excluded because the studies did not assess alcohol use. The flow chart of the study selection procedure is illustrated in Figure 1. Finally, 57 studies that evaluated the relationship between family structure and alcohol use in adolescents were included in this study, of which 29 studies had appropriate data for including in the meta-analysis, and 28 of them just appeared in the systematic review (Table 3). The definitions for alcohol use used by all of the studies included in the systematic review are summarized in Table 1. Of 28 studies, 11 studies (17, 60-69) were not included in the meta-analysis because they reported mean ± SD for the consumption of different alcoholic beverages, eight papers (22, 24, 70-75) reported a linear association between various drinks and different family structures, and nine other studies (33, 39, 76-82) did not report the required information for calculating the association between family structure and alcohol consumption in youth.

The study selection process diagram
The study selection process diagram
Figure 1.

The study selection process diagram

Table 3.

Characteristics of Eligible Cross-sectional and Cohort Studies Evaluating the Effect of Family Structure on Alcohol Consumption in Adolescents

ReferencesCountryStudy DesignNo. of ParticipantsSexAge RangeFamily Structures StudiedResults (Association Between Family Structure and Alcohol Consumption)
(60)USACross-sectional699Female12 - 17Both natural parents, a natural parent alone, stepparentNo significant association was found
(61)USACross-sectional673Both15 - 18Both natural parents, single parent, stepparentNo significant association was found
(24)USACross-sectional1237Both12 - 18Single parent, two-parentA significant association was found between alcohol use and single-parent families among Mexicans.
(62)USACross-sectional481Both17 - 23Divorced, intact familyNo significant association was found
(41)aUKCross-sectional7722Both15 - 16Both parents, mother, father, neither parentsNo significant association was found between alcohol use and living with neither-parent or single-parent
(29)aScotlandCohort627Both13 - 18One parent, reconstituted with stepparent, two-parentA significant association was found between alcohol use and living with an intact family.
(83)USACross-sectional22230Both12 - 17Both parents, mother-father-other, mother-stepfather, father-stepmother, mother only, father only, mother-other relatives, other relative-only, other family typesA significant association was found between alcohol use and living with father-stepmother, mother-only, and father-only
(63)USACross-sectional228Both12Two-parent, single-parent, mother-only, father–only, households headed by guardians or other relativesA significant association was found between alcohol use and single-parent family (Gender × Family Structure interactions in boys)
(35)aUSACohort10803Both13 - 18Single-parent, two-parentA significant association was found between alcohol use and living in a single-parent family.
(76)USACohort4200Both13 - 18Intact nuclear family, having an older siblingA significant association was found between alcohol use, living with an intact nuclear family, and having an older sibling.
(43)aCanadaCross-sectional3564Both12 - 24Two parents, one parent, siblingsNo significant association was found
(44)aUKCross-sectional3984Both14 - 15Both biological parentsNo significant association was found
(30)aFrance and United KingdomCross-sectional4925Both15 - 16Two parents, single-parent, restructured familyA significant association was found between alcohol use and family structure in girls of the UK
(37)aUSACohort1648Both11 - 151-Parents, siblings, grandparents, 2-Mother, father, siblings, 3-Mother, 4-Mother, grandparents, 5-Mother, stepfather, 6-Father, 7-Father, grandparents, 8-Father, stepmother, 9-Grandparents, and 10-other peopleAlcohol use was significantly lower in children living with a biological family than in children living in a broken/restructured family
(36)aUSACohort7188Both< 17Parental loss, death of parents, non-death separationThere was a significant association between parental loss and all forms of separation and increased risk of alcohol use
(77)UKCohort2641Both15 - 16Both parents, non-intactThere was a significant association between alcohol use and single-parent families
(70)11 European countriesCross-sectional34001Female15 - 16Both biological parents, single-parent, stepparent, other (only with a stepparent, foster parent, grandparent, siblings, other relatives, non-relatives)There was a significant association between alcohol use, especially living with a father, stepmother, and single father.
(64)SwitzerlandCross-sectional1488Both15 - 16Single-parent, both parentsThere was a significant association between alcohol use and living with a single parent.
(71)IcelandCross-sectional3524Both15 - 16Two-parent, mother not in the household, father not in the home, stepparentThere was a significant association between alcohol use and living in families where the father was not in the household and the stepparent.
(74)USACross-sectional1027Both13 - 18Biological dad living at home, father-figure living at home, no father at home.No significant association was found
(45)aUSACross-sectional52278Both12 - 18Single-parent, Blended families (stepparent families and other family arrangements)There was a significant association between alcohol use and living with a blended family.
(73)USACross-sectional9657Both12 - 18Single-parentThere was a significant association between alcohol use and living with a single father (females who lived with their fathers were significantly more likely to drink)
(38)aFinlandCohort1132BothBirth - 15Child's separation from one of the parents (before 15 years old), new significant adult in the child's life (before 15 years old)Mother-related variables were associated with child’s separation from one of the parents and alcohol use (before 15 years old)
(65)SwitzerlandCross-sectional3127Both14 - 15Two-parent, single-parent, other set-upsNo significant association was found
(84)aSwedenCross-sectional12,582Both15Two-parent, single-mother, single-father, shared physical custody.There was a significant association between alcohol use and living with single-mother families, single-father families, and shared physical custody.
(33)USACross-sectional97Both13 - 19Two-parent, single-parent, stepparent, other family membersThere was a significant association between alcohol use and living with a single parent.
(78)USACross-sectional1256Both13 - 19One-parent, two-parentThere was a significant association between alcohol use and living with one parent and two parents.
(79)USACross-sectional2138Both12 - 14Both parents, single-mother, mother and stepfather, mother and other adult, non-relatives or guardian householdsNo significant association was found
(17)SpainCross-sectional386Both12 - 17Nuclear family, single-parent family, extended family, bi-nuclear familyNo significant association was found
(46)aUSACross-sectional255Both14 - 16Only mother, only father, older siblings, younger siblings, grandparentsThere was a significant association between alcohol use and living with older siblings
(47)aGreeceCross-sectional500Both17 - 20Divorced (single parent), intact family (biological parent)No significant association was found
(48)aFranceCross-sectional15000Both12 - 18Intact family, reconstituted family, single-parent familyThere was a significant association between alcohol use and girls living in an intact family, reconstituted family, and single-parent family.
(72)USACohort10704Female14 - 16Biological/adoptive parent, mother-only, father-only, mother-stepfather, father-stepmother, dissolution of the parental relationship (divorced)There was a significant association between alcohol use and living with mother-only, father-only, mother-stepfather, and other families.
(49)aUSACross-sectional128Both13 - 19Two-parent, One-parentThere was a significant association between alcohol use and not living with biological parents.
(50)aUSACross-sectional8795Both12 - 16Two-parent, non-intact families (father-stepmother, mother-only, father-only, mother-stepfather)There was a significant association between alcohol use and living in two-parent, father-stepmother, or other family structures.
(51)aRomaniaCross-sectional290Both14 - 20Intact, non-intact, reconstructed familyNo significant association was found
(18)aSlovakiaCross-sectional3694Both14 - 15Parental divorce, single, complete familyThere was a significant association between alcohol use and living with a divorced parent.
(39)aAustraliaCohort4158Both5 - 14Married/same partner, single/no partner, one change of partner, two or more partnersThere was a significant association between alcohol use and living with parents that were married/same partner or single/no partner, living with parents that had one change of partner and two or more partners.
(52)aAustraliaCross-sectional8256Both10 - 14Two-parent, single motherThere was a significant association between alcohol use and living with two parents and a single mother.
(31)aHong KongCross-sectional32961Both12 - 17Intact, non-intact (no-parent, single )There was a significant association between alcohol use and living with non-intact families.
(66)USACross-sectional4173Both12 - 18Father-only, mother-only, dual-parentThere was a significant association between alcohol use and living with father-only.
(67)USACohort20745Both13 - 18Both biological parents, one biological parent (single), stepparents, otherThere was a significant association between alcohol use and living with a single parent.
(69)AustraliaCohort4281Both14 - 18Divorce, siblingsNo significant association was found
(80)Northern EuropeCross-sectional53053Both12 - 18Single-parent, stepparent, both parentsThere was a significant association between alcohol use and living with an incomplete family.
(68)USACohort8026Both12 - 18Biological parent, stepparent, non-parent families (grandparent, an aunt and/or uncle, older siblings, extended family)There was a significant association between alcohol use and living with a single parent.
(22)BelgiumCross-sectional1688Both11 - 18Both parents, broken family (single, stepparent)There was a significant association between alcohol use and living with stepparent and single-parent
(53)aUSACross-sectional14268Both18Both parents, mother alone, father alone, otherThere was a significant association between alcohol use and living with both parents.
(19)aEuropeCross-sectional12115Both12 - 18Both, single, stepparentsThere was a significant association between alcohol use and living with both parents, single-parent, one-parent, and one-stepparent.
(54)aHong KongCross-sectional21627Both11 - 20Married, divorced, loss of one parentThere was a significant association between alcohol use and living with a married parent, divorced parent, and loss of one parent.
(55)aSlovakiaCross-sectional3882Both10 - 16Complete and incomplete familyThere was a significant association between alcohol use and living with complete and incomplete families.
(75)USACohort2051Both12 - 17Both biological parents, non-intact (single-parent, blended: one biological parent and one stepparent)There was a significant association between alcohol use and living with a non-intact family.
(56)aUSACross-sectional1036Both15 - 18Both parents, alternative (other)No significant association was found
(81)USACohort193Both14 - 18Nuclear family, both parentsThere was a significant association between alcohol use and living with both parents.
(40)aUSACohort931Female10 - 15Divorced only, separated only, both separation and divorceThere was a significant association between alcohol use and living with divorced parents and separated parents
(57)aUSACross-sectional360Both12 - 18Both parents, otherNo significant association was found
(82)TurkeyCross-sectional8402Both12 - 18Single (separation, loss), both parentsThere was a significant association between alcohol use and living with a single parent and both parents.
(42)aUSACross-sectional193202Male11 - 15Mother-father, mother-father-grandparent, single mother, single father, mother-stepfather, father-stepmother, mother-grandparent, father-grandparent, grandparents only, no parents or grandparents, joint custody, other family typesThere was a significant association between alcohol use and living with mother-father, mother-father-grandparent, single mother, single father, mother-stepfather, father-stepmother, joint custody, and other family types

a Included in the meta-analysis.

Among the reviewed articles included in the meta-analysis, 12 were conducted in the United States (35-37, 40, 42, 45, 46, 49, 50, 53, 56, 57), two in France (30, 48), two in the UK (41, 44), two in Hong Kong (31, 54), two in Slovakia (18, 55), two in Australia (39, 52), and one in each of countries Canada (43), Greenland (19), Greece (47), Scotland (29), Romania (51), Sweden (84), and Finland (38) (Table 3). The participants' age ranged from 10 to 24 years. The studies' sample size ranged from 128 to 52,278 participants, and 279,012 individuals participated in all studies. The characteristics of studies used in the systematic review and meta-analysis are summarized in Table 3.

4.2. Non-intact Versus Intact Family

Our analysis of 28 studies revealed that the likelihood of alcohol consumption more than once per month was 27% higher among teenagers with non-intact families (OR = 1.27, 95% confidence interval (95% CI): 1.19, 1.36) compared to those with intact families (Figure 2). We recognized a significant heterogeneity (Cochran's Q test, Q statistic = 98.87, P < 0.001, I2 = 69.7%) with no apparent reason to justify it. Therefore, we performed sensitivity analysis and divided non-intact families into different subgroups. The sensitivity analysis showed that none of the individual studies examining the association between non-intact families and the likelihood of alcohol use significantly changed the overall results. Although a slight asymmetry was seen in Begg's funnel plot, there was no evidence of publication bias in the selected studies assessing the effect of non-intact family on alcohol use (Begg's test, Z value = 0.01, P = 0.919; Egger's test, coefficient = 0.076, P = 0.903).

Forest plot illustrating weighted odds ratios of alcohol use in adolescents with non-intact families compared to those with intact families.
Forest plot illustrating weighted odds ratios of alcohol use in adolescents with non-intact families compared to those with intact families.
Figure 2.

Forest plot illustrating weighted odds ratios of alcohol use in adolescents with non-intact families compared to those with intact families.

4.3. Single-Parent Versus Intact Family

The analysis of eight articles showed that alcohol use was more likely in adolescents living with single parents than those living with both biological parents (OR = 1.27, 95% CI: 1.17, 1.41). However, there was significant heterogeneity between studies (Cochran's Q test, Q statistic = 53.06, P < 0.001, I2 = 73.6%) (Figure 3). No evidence of publication bias was observed in the studies included in the meta-analysis (Begg's test, Z value = 0.59, P = 0.553; Egger's test, Coefficient = 0.65, P = 0.498).

Forest plot illustrating weighted odds ratios of alcohol use in adolescents living in single-parent families compared to those with intact families.
Forest plot illustrating weighted odds ratios of alcohol use in adolescents living in single-parent families compared to those with intact families.
Figure 3.

Forest plot illustrating weighted odds ratios of alcohol use in adolescents living in single-parent families compared to those with intact families.

4.4. Father-Only Versus Intact Families

The evidence indicated that living only with a father increased the odds of drinking alcohol (OR = 1.35, 95% CI: 1.13, 1.60), but there was significant heterogeneity between studies (Cochran's Q test, Q statistic = 17.87, P = 0.02, I2 = 55.2%). The sensitivity analysis showed the main finding did not change by removing each study one by one. Although a slight asymmetry was seen in Begg's funnel plots, there was no evidence of publication bias using statistical tests (Begg's test, Z value = 0.52, P = 0.602; Egger's test, Coefficient = -1.07, P = 0.375).

4.5. Mother-Only Versus Intact Family

The finding from this meta-analysis showed that living only with mother also increased the chance of alcohol consumption in adolescents (OR = 1.25, 95% CI: 1.16, 1.34), and the variability in the effect size due to heterogeneity was low (Cochran's Q test, Q statistic = 11.33, P = 0.184, I2 = 29.4%). The sensitivity analysis showed that none of the individual studies examined the mentioned association. Even though there was a slight asymmetry in Begg's funnel plots, no evidence of publication bias was seen using asymmetry tests (Begg's test, Z value = 1.05, P = 0.295; Egger's test, Coefficient = 1.28, P = 0.181).

4.6. Divorced Versus Intact Family

Six articles reported an association between living with divorced parents and alcohol consumption in adolescents (18, 36, 39, 40, 50, 54). This meta-analysis suggested an increased likelihood of alcohol use among young people (OR = 1.31, 95% CI: 1.28, 1.39) while there was no significant heterogeneity between the results of articles (Cochran's Q test, Q statistic = 6.77, P = 0.34, I2 = 11.3%, Figure 4). The sensitivity analysis showed that none of the individual studies significantly affected overall results. Although a slight asymmetry was seen in Begg's funnel plots (supporting information Figure 4), there was no evidence of publication bias in the selected studies assessing the effect of divorced families on alcohol use (Begg's test, Z value = 0.90, P = 0.368; Egger's test, Coefficient = 0.56, P = 0.546).

Forest plot illustrating weighted odds ratios of alcohol use in adolescents living in a family with divorced parents compared to those with intact families.
Forest plot illustrating weighted odds ratios of alcohol use in adolescents living in a family with divorced parents compared to those with intact families.
Figure 4.

Forest plot illustrating weighted odds ratios of alcohol use in adolescents living in a family with divorced parents compared to those with intact families.

4.7. Parent-Absent Versus Intact Family

The parental loss was defined as a disruption of the parent-child relationship through the age of 16 because of death or other causes (36). This meta-analysis showed a significant positive association (OR: 1.33, 95% CI: 1.19, 1.48) between the loss of parents and the amount of alcohol drinking. No heterogeneity was shown in this subgroup (Cochran's Q test, Q statistic = 1.48, P = 0.688, I2 = 0.0%). The sensitivity analysis showed no change in the overall result with the elimination of each study. No evidence of publication bias was found (Begg's test, Z value = -0.34, P = 1.00; Egger's test, Coefficient = -0.37, P = 0.750).

4.8. Stepparent Versus Intact Family

Stepparent family was considered as living with one birth parent (either father or mother) and one stepparent (either stepfather or stepmother) (19). The meta-analysis showed that the existence of stepparents in the family might be related to the likelihood of alcohol consumption with the OR of 1.57 (95% CI: 1.39, 1.77) while the heterogeneity was moderate (Cochran's Q test, Q statistic = 12.99, P = 0.07, I2 = 46.1%, Figure 5). The sensitivity analysis showed no important study. There was no evidence of publication bias (Begg's test, Z value = 0.87, P = 0.386; Egger's test, Coefficient = 0.391, P = 0.741).

Forest plot illustrating weighted odds ratios of alcohol use in adolescents living with stepparents compared to those with intact families.
Forest plot illustrating weighted odds ratios of alcohol use in adolescents living with stepparents compared to those with intact families.
Figure 5.

Forest plot illustrating weighted odds ratios of alcohol use in adolescents living with stepparents compared to those with intact families.

4.9. Other Types of Parental Family Versus Intact Family

In this study, adolescents who had other categories of family structure, except for father-only, mother-only, divorced parents, parent-absent, and stepparent family structures, were considered to be in other types of parental families (in which none of the natural parents, including grandparents, aunts, uncles, cousins, siblings, and adopted children were present). This meta-analysis showed a significant positive association between these family structures and alcohol use (OR = 1.42, 95% CI: 1.15, 1.76). There was heterogeneity between studies reporting the association between other parental families and alcohol abuse (Cochran's Q test, Q statistic = 17.80, P = < 0.001, I2 = 77.5%). The sensitivity analysis showed no effective study on the overall result after its deletion. Although a slight asymmetry was seen in Begg's funnel plots, there was no evidence of publication bias in the selected studies assessing the effect of other types of the parental family on alcohol use (Begg's test, Z value = 0.73, P = 0.462; Egger's test, Coefficient = -1.44, P = 0.601).

5. Discussion

The present study assessed the association between family structure and alcohol use among adolescents. The analyses revealed that growing up in a non-intact family was associated with adolescent alcohol use. To the best of our knowledge, this is the first systematic review and meta-analysis on this subject. For centuries, alcohol consumption has been part of culture and society. Drinking alcohol is a social activity embedded today in traditional and sociocultural contexts (85).

Our results showed that most adolescents in emotionally broken families experienced parental fighting and domestic violence. The results also highlighted that the presence of a stepparent and substance use in the family was seen to be common family factors that may act as predictors of antisocial behavior among adolescents (86).

The previous studies reported that adolescents from non-intact families were more likely to be weekly drinkers (31). Still, Habib et al. stated that family structure might not predict alcohol use in adolescents (52). Living in families with two biological parents is a factor that protects against alcohol use in adolescence. In contrast, adolescents from single-parent families attempt to drink more than adolescents from both-parent families (87). This statement is valid for the frequentness of alcohol use, the number of drinks on a routine day of drinking, and also the frequentness of excessive consumption (19, 88, 89). However, the findings from some studies showed that there was no significant association between alcohol use and the existence of only one parent at home (29, 37, 43, 46, 48).

Considering the growing number of adolescents living in single-parent families, we should continue considering the relationship between alcohol consumption and family structure (83). There are trends to offer that adolescents in single-father families might be at a higher chance of alcohol consumption and drunkenness than the others (84). This finding was also shown in the present study. However, it should be noted that we did not compare father-only families with mother-only families. In addition, parental divorce/separation has been shown to raise the later risk of alcohol dependence and difficulties among adolescents; however, its effect on the early phases of alcohol dependence has only recently been cleared (40). Sartor et al. (2007) noticed that parental separation predicted a younger age of first drink in children of a twins sample of young adults (90). Divorce provides a potent example, as alcoholic parents are at high risk of marital disintegration (91). It is, therefore, essential to keep in mind the moment at which the divorce occurs since it appears that older adolescents react by decreasing their relationship with the family and requesting support systems outdoors (92). Predisposing factors and resources shape families' responses to stressful events such as divorce. These may include finances, education, practical coping strategies, religiosity and spirituality, a history of successfully managing normative stressor events, cohesion, adaptability, and shared power. Unhealthy coping mechanisms like alcohol consumption in adolescents can also be considered (93).

In line with the result of our study, Huang et al. found that adolescents' current drinking status was associated with having one or both parents deceased (54). Kendler et al. reported that parental loss is a risk factor for alcohol dependence. They also found an increased risk of alcohol dependence after parental separation; however, the alcohol dependence was not increased after parents' death. Although the authors suggested that there was unlikely any direct causal link between the risk of alcohol dependence and separation, it may be interceded by indirect factors pointed to family disorganization and genetic factors (36).

Several lines of evidence suggest that alcohol consumption was significantly lower in adolescents who lived in a family with both birth parents than in adolescents living in a family with biological parents, single parents, or one birth parent and one stepparent (19, 94). Further, it was reported that adolescents had higher drinking quantities in single-parent and stepparent families than in both birth-parents families. It was concluded that living with biological parents is protective against alcohol drinking in adolescence (19). Stepparent families might experience a significant alternation during the initial family disconnect, terminating a higher risk of drinking problems (94).

In the absence of one of the parents in the family, adolescents were to receive lower supervision during outside activities (95). Also, it is shown that poor supervision and monitoring by parents could propel adolescents forward to peers to meet their emotional needs (96). Furthermore, studies have demonstrated the influence of friends on drinking experiments and pleasure night outs (97), and some papers noticed that young people feel trust and safety in peer groups (98). In addition, the availability of alcohol at an early age increases in unstructured families (40). Family conflict is another mediator for increasing alcohol consumption, even though it is unclear whether this conflict occurs before the divorce or appears after (99). Therefore, these stressful conditions could lead to consuming alcohol more frequently (96).

Three studies (50, 53, 83) showed a significant association between alcohol consumption and living in other types of family such as living with grandfathers or grandmothers, siblings, other relatives, foster homes, or someone else. It was shown that living with someone else other than a parent increased the odds of alcohol use (53). In addition, living in an extended family with other or non-family members was also a risk factor for alcohol use (68).

The present study was subject to several limitations. We were unable to investigate additional subgroups (e.g., different types of two-parent households in addition to stepparents: both biological parents vs. grandparents, other relatives, adoptive, foster, other adults, etc.). In addition, examining the effect of other moderators like age, sex, religion, and ethnic background that could explain the heterogeneity in the effect sizes would be worthwhile for future researchers in this area to pursue. It is worth mentioning that the extracted effect sizes were originated from crude analyses and were derived from studies with cross-sectional designs. Therefore, conducting large-scale prospective studies that consider the effect of modifiers in their analyses might better elucidate the association between family structure and alcohol use in future investigations. Also, Sandstrom (2013) stated that economic instability might harm children by undermining their health (100). Working rules and sick leave often reduce poverty for families. Family benefit schemes may increase the risk of single-parent families in poverty over couple-parent families; however, the decomposition analyses show that family benefits help reduce poverty for all, especially single-parent families (101).

Given that living in single-parent households may be a risk factor for children's health, the public health-care system should provide additional social care for single-parent households. Further investigations are necessary using more detailed longitudinal data, including environmental and family factors and the severity of adolescents' health conditions to support our findings (102). It should also be noted that we could not include some investigations in this meta-analysis because of heterogeneity between study reports and missing data. In addition, only studies published in English were included in the review, which might have skewed the results. Further, we did not observe any evidence of publication bias based on funnel plots in the meta-analysis of included studies. Another limitation of the study is that the authors did not compare alcohol drinking behaviors across different age groups. Also, the frequency and drinking behavior of adolescents could not be assessed.

In addition, some studies varied in the definition of family structure and often overlapped conceptually, which could affect the analysis; however, we reduced this limitation by conducting subgroup analyses. Despite these limitations, the current review provides valuable results of the effects of the types of family structure on alcohol consumption in adolescents.

In summary, the published research demonstrates that living with both biological parents significantly reduces alcohol consumption in adolescents than living in other types of non-intact families such as a single-parent, father-only, mother-only, divorced-parent, parent-absent, stepparent, and other types of parental families. Family health and its stability could have an essential role in reducing high-risk behaviors, including alcohol use and its consequences in adolescents. Further investigation is required to assess familial, parental, and psychosocial protective factors within different family structures influencing adolescents' drinking.

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