1. Background
The post-partum period is recognized as a time when many women are vulnerable to a variety of emotional symptoms (1). The most prevalent mental or emotional problem associated with childbirth is post-partum depression (PPD); having an adverse effect on the whole family (2-4). PPD is a cross-cultural phenomenon observed in widely diverse cultures and its outbreak rate was reported as high as 60% - 80.2% in the developing world (1, 5). Studies comparing PPD among rural and urban women are limited. Villegas et al. reported the prevalence rate ranging from 21.5% - 31.3% in rural residents of developed and developing counties, respectively (6). An Iranian study revealed PPD as 57.1% among Isfahan located rural residents (7) in comparison with the reported rate of 20.3% - 35% in both rural and urban women (8, 9). Although, using different tools or cut-off points may cause this variation.
In Iran, about 30% of the population lives in rural areas. Hence it seems that PPD is more of a concern than other medical problems for childbearing age women. A number of risk factors have been proposed for PPD development. However, the results are not conclusive (10) and the issue as to whether residence is a risk factor for PPD remains controversial. Some studies reported urban women to be more vulnerable to PPD than those rural dwellers (11, 12), while other studies results are inconsistent (10, 13).
2. Objectives
The women in cities and villages live under different socioeconomic conditions. Consequently, the impact of residence as well as the relation between this and other risk factors on PPD may differ (12). The current study examined the potential impact of related risk factors on PPD’s rate and risk in urban and rural areas women.
3. Materials and Methods
The goal of this study as a part of a large longitudinal cohort research is to compare the contribution of probable risk factors to PPD prevalence and risk in urban and rural areas of Mazandaran province, Iran.
There are 16 urban and 213 rural geographic areas in this state. In this study, all 16 cities and 4 urban areas from 4 geographic parts of each city (North, South, West and East) were selected as the study locations. There are 101 and 207 primary health centers (PHCs) in urban and rural areas, respectively, providing services for approximately 98% of pregnant women in the province. Out of 42000 pregnant women, 9187 (4684 in urban and 4503 in rural) were in their 3rd pregnancy trimester and referred to the clinics for antenatal care during the recruitment period from January to June 2009, as part of the study population. Of this population, 2626 women were eligible and entered the study and of these, 2359 (89.8%) volunteered and 2279 (96.6%) completed the initial questionnaires. The final sample which followed the study period from 32 - 42 pregnancy to 12 postpartum weeks (n = 1982; 86.96%) consisted of 1012 (51.1%) urban and 970 (48.9%) rural women with a drop-up rate of 297 (13.03%). G-power software for logistic regression was used to estimate the sample size (14).
Educated health care practitioners reviewed the households’ documents to identify appropriate women based on our inclusion criteria and distributed the questionnaires among eligible women. Literate women aged 16 - 45 years old with gestational age of 32 - 42nd weeks that attended PHCs for prenatal care were recruited in this study. The women under pharmacological treatment for psychiatric problems were excluded from the study. The potential risk factors (indicators) in the 3rd pregnancy trimester and after birth were utilized to estimate the depression risk within 12 post-partum weeks. The participants provided information on the demographics, socio-economic, mental health, abuse history, hormone related factors, social support, life events, marital relationships, complications during pregnancy, delivery and after birth, rituals and customs and postnatal parenting self-efficacy using the standardized questionnaires explained in detail somewhere else (15-17). Validated instruments that were used in this study included the premenstrual syndrome questionnaire (PMSQ) (18), social support appraisals scale (SSA) (19), network orientation scale (NOS) (20), general health questionnaire (GHQ-28) (21), marital inventory (ENRICH) (22), life events rating scale (LERS) (23), parental expectation survey (PES) (24), Edinburgh postnatal depression scale (EPDS) (25) and a researchers design questionnaire that include demographic characteristics, information on mental health, hormone related conditions, abuse history, obstetric and gynecological data and rituals and customs after childbirth.
Mental health status was evaluated employing EPDS (25) that includes 10 mood related items. The mothers are scored from zero to three (“no, not at all” to “yes, quite often”) according to the symptoms’ severity during the previous week. The total score is calculated by computing the scores for each of the 10 items with seven of them being scored reversely (26). A score more than 12 was considered as the probability of a woman with PPD in Iran (27). The study was verified by the Medical Ethics Committees of University Putra Malaysia (UPM) (grant number 200945) and Mazandaran University of Medical Sciences (MAZUMS) in Iran (grant number 88-20). The women gave written consent at the time of entering the study.
The data was exported to IBM-SPSS V. 20. To determine the similarities and differences between the urban and rural groups in terms of related variables, the data was analyzed using chi-square for the categories and independent sample t-test for continuous variables. The prevalence of depression at each event was calculated and compared between the urban and rural residing women.
To predict the association between the potential risk factors and PPD within 12 post-partum weeks, binary logistic regression analysis was applied generating the corresponding odds ratios (OR) coupled with 95% confidence intervals (CI). Then in the multiple logistic regression model, the variables with P values less than 0.25 in univariate analysis as well as those variables significantly different between the urban and rural women resulting from chi-square and t-tests, were forced in the model using the rural group as the referent category. We applied this model once for the entire sample and again among the urban and rural women separately. Hierarchical multiple logistic regression model was used to see which variables came out significant. Based on the literature review and the preliminary exploratory method, the variables were entered in sequential order: the psychological, sociological, socio-demographic hormone-related, cultural and obstetric and gynecological factors, respectively.
4. Results
Out of 2279 women who agreed to take part in the study, 1982 followed the study until 12 post-partum weeks. A comparison was conducted between the women who followed (86.96%) and the ones who didn’t (13.03%) with no significant differences between these two groups in terms of the average age (25.05 vs. 25.7 years), the education of the women and that of their husbands, total family income as well as the previous PPD.
The mean age and marriage time age of the women was 25.05 ± 5.20 and 20.52 ± 4.09 years, respectively. About two thirds of the women (60%) had no children and over 90% of them breastfed exclusively during three post-partum months. Half of the women (48.90%) were recruited from rural PHCs, and the rest (51.1%) from urban PHCs. Of the urban women, 54.9% lived in nuclear families, 60% lived in rented premises, and were of higher socio-economic status compared to the rural ones [income (334827.07 vs. 297500.00 Rials/mo), educational level (11.23 vs. 8.98 years), and employment (73.3% vs. 26.3% )]. Their husbands were also more employed as governmental servants compared with the rural men working as farmers (67.6% vs. 79.5%). The urban women reported more medical diseases (57.9%), were more likely to deliver in private hospitals (65%) and had lower participation in health educational programs during pregnancy (48.8%) compared to the rural dwellers. Moreover, urban women were more likely to report lower health status based on GHQ (54.7%), more pregnancy period induced anxiety (54.7%), irritable mood before menstruation (60.3%) and mood instability in puberty (59.1%) in comparison with those of the rural areas. Tables 1 and 2 described and compared the characteristics of rural and urban dwelling women. The mean differences of the continuous variables in the two groups of women is illustrated in Table 3.
Table 1.
Comparing Socio-Demographic and Obstetric Characteristics of Urban and Rural Women Using Chi-Square Test (N = 1982)a
| Variables | Urban (N = 1012) | Rural (N = 970) | P Value |
|---|---|---|---|
| Family structure | 0.001 | ||
| Extended | 227 (41.1) | 325 (58.9) | |
| Nuclear | 785 (54.9) | 645 (50.1) | |
| Housing | 0.001 | ||
| Renter | 509 (60) | 274 (35) | |
| House owner | 503 (42) | 696 (58) | |
| Employed | 0.001 | ||
| Housewife + student | 925 (49.6) | 939 (50.4) | |
| Employment | 87 (73.3) | 31 (26.3) | |
| Husband employed | 0.001 | ||
| Business | 678 (50.1) | 674 (49.9) | |
| Farmer | 27 (20.5) | 105 (79.5) | |
| Jobholder | 189 (67.6) | 90 (32.3) | |
| Others | 118 (53.9) | 101 (46.1) | |
| Medical diseases | 143 (57.9) | 104 (42.1) | 0.01 |
| Gestational diabetes | 40 (48.4) | 43 (51.8) | 0.33 |
| Gestational hypertension | 41 (49.4) | 42 (50.6) | 0.42 |
| Recurrent urinary infection | 123 (51.5) | 116 (48.5) | 0.47 |
| Morning sickness | 83 (51.6) | 78 (48.4) | 0.48 |
| Back pain | 64 (56.6) | 49 (43.4) | 0.12 |
| Planned pregnancy | 786 (50.2) | 780 (49.8) | 0.11 |
| Participating in Health Education Program | 809 (48.6) | 857 (51.4) | 0.001 |
| Delivery mode | 0.19 | ||
| Cesarean section | 203 (53.3) | 178 (46.7) | |
| Vaginal | 524 (50.5) | 511 (49.50 | |
| Place of delivery | 0.001 | ||
| Private hospital | 208 (65) | 112 (35) | |
| Public hospital | 803 (48.4) | 855 (51.6) | |
| Sex of the baby | 0.28 | ||
| Male | 510 (51.4) | 483 (48.6) | |
| Female | 501 (50.9) | 484 (49.1) | |
| Time delivery | 0.13 | ||
| < 37 | 186 (53.9) | 159 (46.1) | |
| ≥ 37 | 823 (50.5) | 808 (49.5) | |
| Neonatal morbidity | 135 (54.2) | 114 (45.8) | 0.16 |
| Puerperal complication | 305 (51.4) | 288 (48.6) | 0.44 |
| Breastfeeding status for three months | 0.06 | ||
| Exclusive breastfeeding | 894 (50.5) | 876 (49.5) | |
| Bottle feeding or mix feeding (breastfeeding and bottle feeding) | 108 (56.5) | 83 (43.5) |
aValues are expressed as No. (%).
Table 2.
Comparing Psycho-Social and Hormone Related Factors of Urban and Rural Women Using Chi-Square Test (N = 1982)a
| Variables | Urban (N = 1012) | Rural (N = 970) | P Value |
|---|---|---|---|
| Depression during 32 - 42 weeks of pregnancy based on EPDS | 0.06 | ||
| ≤ 12 | 782 (50.1) | 778 (49.9) | |
| > 12 | 230 (54.5) | 192 (45.5) | |
| General health status from GHQ scores | 0.002 | ||
| Good (21 or less) | 484 (54.7) | 401 (45.3) | |
| Weak (more than 21) | 528 (48.1) | 569 (54.9) | |
| Previous post-partum depression | 34 (54.8) | 28 (45.2) | 0.28 |
| Depression in the 1st and 2nd trimesters of pregnancy | 133 (51.4) | 126 (48.6) | 0.48 |
| Anxiety in pregnancy | 509 (54.7) | 421 (45.3) | 0.001 |
| Irritable mood before menstruation/pre-menstruation | 210 (60.3) | 138 (39.7) | 0.001 |
| Irritable mood | 133 (59.1) | 92 (40.9) | 0.006 |
| Puberty mood instability | 254 (45.4) | 306 (54.6) | 0.26 |
aValues are expressed as No. (%).
Table 3.
Socio-Demographic, Psychological, and Cultural Differences in Two Urban and Rural Groups of Women Using t-Test (N = 1982)a
| Variables | Urban (N = 1012) | Rural (N = 970) | P Value |
|---|---|---|---|
| Age, y | 26.23 (5.23) | 25.86 (5.17) | 0.62 |
| Marriage time age, y | 20.75 (4.20) | 20.27 (3.97) | 0.26 |
| Parity | 0.48 (0.66) | 0.51 (0.68) | 0.10 |
| Education, y | 11.23 (3.01) | 9.98 (2.99) | 0.001 |
| Husband education, y | 11.02 (3.15) | 9.88 (3.18) | 0.11 |
| Household Income, Tomans, monthlyb | 334827.07 (162387.72) | 297500.00 (136071.45) | 0.001 |
| Depression during 32-42 weeks of pregnancy based on EPDS | 8.86 (4.93) | 8.38 (4.86) | 0.79 |
| Depression within 12 post-partum weeks based on EPDS | 8.53 (4.97) | 8.08 (4.98) | 0.69 |
| General health status from GHQ | 22.85 (9.22) | 21.30 (9.06) | 0.30 |
| Social support during pregnancy from SSA | 47.87 (5.40) | 47.37 (5.02) | 0.06 |
| Social isolation during pregnancy from NOS | 48.34 (4.47) | 47.88 (4.20) | 0.06 |
| Marital satisfaction during pregnancy from MS | 24.56 (4.21) | 24.88 (3.70) | 0.01 |
| Parenting self-efficacy from PES | 7.84 (1.50) | 7.94 (1.53) | 0.37 |
| Number of life events from LERs | 3.24 (2.96) | 3.00 (3.01) | 0.29 |
| Abuse victim or abuse witness | 0.68 (2.11) | 0.68 (2.03) | 0.93 |
| Number of ritual practices during postnatal periodc | 14.11 (4.15) | 14.18 (3.80) | 0.08 |
Abbreviations: Abused, refers to all forms of abuse including physical, emotional, sexual abuse, and negligence; EPDS, Edinburgh postnatal depression scale; GHQ, general health questionnaire; LERS: life event rating scale; MS, ENRICH marital inventory; NOS, network orientation scale; PES, parental expectation survey; SSA, social support appraisal.
aValues are expressed as mean (SD).
bTomans; 10 Rials; (1 Tomans = 0.01 USD).
cThe number of ritual practices was ranging from 0 to 27 where higher score show greater practice of rituals.
Depression during 32 - 42 weeks of pregnancy and 12 post-partum weeks based on EPDS scores was more common in the urban women compared to the rural ones with no significant difference between the two groups as Table 4 depicts.
Table 4.
Prevalence Rate of Post-Partum Depression in Urban and Rural Women (N = 1982)a
| Variables | Urban (N = 1012) | Rural (N = 970) | P Value |
|---|---|---|---|
| Depression during 32-42 weeks pregnancy based on EPDS | 230 (22.7) | 192 (19.8) | 0.06 |
| Twelve post-partum weeks depression based on EPDS | 203 (20.1) | 173 (17.8) | 0.11 |
aValues are expressed as No. (%).
In a separate multiple logistic regression model, depression during 32 - 42 weeks of pregnancy based on EPDS and parenting self-efficacy from PES have been the significant factors to predict PPD in both urban and rural women. Moreover, urban and rural-specific risk factors of depression which applied to the women after their delivery in the two groups are seen in Table 5. As Table 5 shows, greater social isolation based on NOS in urban women and lower general health based on GHQ, living in an extended family, lower educational level and more medical diseases in rural women have been the significant factors to predict PPD.
Table 5.
Significant Variables Predicting Post-Partum Depression in Separate Multiple Logistic Regression Model in Urban and Rural Women (N = 1982)
| Variables | Urban (N = 1012) | Rural (N = 970) | ||||
|---|---|---|---|---|---|---|
| Odds Ratio | 95% CI | P Value | Odds Ratio | 95% CI | P Value | |
| Depression during 32-42 weeks of pregnancy based on EPDS | 1.26 | 1.20 - 1.32 | 0.001 | 1.28 | 1.22 - 1.34 | 0.001 |
| Parenting self-efficacy from PES | 0.88 | 1.00 - 1.09 | 0.02 | 0.81 | 0.72 - 0.92 | 0.001 |
| Social isolation during pregnancy from NOS | 1.04 | 0.79 - 0.98 | 0.02 | - | - | - |
| General health status from GHQ | - | - | - | 1.03 | 1.00 - 1.05 | 0.006 |
| Family structure | - | - | - | 0.59 | 0.39 - 0.88 | 0.01 |
| Education | - | - | - | 0.91 | 0.85 - 0.97 | 0.006 |
| Medical diseases | - | - | - | 1.99 | 1.03 - 3.85 | 0.04 |
| Gestational diabetes | - | - | - | 0.42 | 0.19 - 0.95 | 0.03 |
5. Discussion
The answer to the question, i.e., whether geographic location is a protective factor for PPD development was evaluated. This study found no significant difference in PPD rate in the urban and rural women (20.1% vs. 17.6%). It seems that in our study, maybe other factors are more significant than living place to predict PPD.
The studies comparing PPD prevalence rate among the rural and urban women living in developed countries, such as Australia, reported higher rates of PPD in the rural (8.5%) compared to urban (6.6%) women with no significant difference (12, 13). A PPD-related study comparison in the two groups of women in a developing country such as Lebanon, reported higher rate of PPD among the rural women (26%) to the urban ones (16%) (28). In a systematic review, PPD prevalence was higher among the rural women than the urban ones, especially in developing countries (21.5% in developed countries rural women vs. 31.3% in developing countries’ rural ones) (6). Low socio-economic status such as low income and low education as well as poor life quality and lack of mental health services may contribute to the onset of mental illness among rural women (6, 29, 30).
Comparisons between the rural and urban women’s characteristics yielded some differences between the two groups of women. Socio-economic and health status was somewhat higher in the urban women than that of the rural ones, which could be attributed to poverty in rural areas. In turn, urban women suffer more from social isolation that could be related to urbanization consequences in urban residence. A study highlights the importance of social relations rather than social conditions in determining depression in urban Pakistani pregnant women (31). Family structure reform leading to diminished supportive care proved as a significant determinant of PPD (32).
Regarding PPD predicting factors, women from both rural and urban areas shared common PPD risk factors including depression during 32 - 42 weeks of pregnancy and low parenting self-efficacy. Antenatal depression was the strongest predictor of PPD development in numerous studies (33, 34). In a research in rural Tamil Nadu, India, nearly a half of PPD patients reported previous episodes taking place during or prior to pregnancy (35). The continued contacts health care providers have with mothers during pregnancy create an excellent opportunity for screening and intervention when required.
This study is compatible with several other studies in demonstrating that low parenting self-efficacy plays significant roles in PPD development (36-38). Child care induced stress was discovered more in Taiwanese women receiving higher scores in EPDS during post-partum period (39). It is possible that these women were not prepared for mothering during their pregnancy (40).
Separate multiple analyses identified additional PPD risk factors in urban women such as the perceived social isolation, and in rural women, lower general health status based on GHQ, living in an extended family, lower education, experiencing medical diseases and gestational diabetics. Differences in PPD risk factors between the rural and urban women may be due to different socio-economic and environmental situations in these two groups of women (6).
Although there was no significant difference in the support level the rural and urban women received, social isolation was proved as a significant factor to predict PPD among the urban women. Social isolation also revealed a strong association with PPD in developed nations’ women such as Denmark, Italy and Canada (36, 41, 42) compared with the women not reporting feelings of social isolation. In recent decades, fast demographic and socio-economic reforms have been experienced by the societies in developing countries and traditional family structure reforms and diminished supportive care have turned as the potential determinants of PPD (32, 43). This reform has probably led women to turn to friends rather than to family members for support and in the cases when a woman has had no affective bonds outside the family or when such bonds have been weak, depressed mood has increased.
Surprisingly, our rural sample data analysis suggested that rural women living in extended families have been more predisposed to PPD. It is possible that in rural women, in-laws conflict especially with their mothers-in-law is an important factor in determining post-partum emotional adjustment failure, which leads to depression (44). Another issue requiring further investigation is the satisfaction regarding the support experienced. In a study conducted in Mexico, the results suggested that the women with unfulfilled desire for support and paradoxically, those with excessive support felt isolated much more and thus are more vulnerable to PPD (45).
Concerning the relationship between education and PPD in rural women, in line with other rural studies in Iran (7), our study derived results demonstrated a positive one. However, the studies on the relationship between education and PPD often generate conflicting findings with positive (34, 46) and negative (42, 47) results in both developed and developing countries (e.g. Pakistan, New Mexico, Turkey, Italy, Japan). It is difficult to contextualize and interpret educational levels because of a close relationship between education and employment, income and socio-economic status (41). Further studies are required to prove this relationship.
In agreement with a Lebanese research, medical ill-health has also been associated with PPD solely in the rural women (28). Medical diseases may change or disturb neurotransmitter action or turn into the stressor itself, thus making them vulnerable to depression (28). The possible reason behind discovering no association between medical problems and PPD in urban women could be attributed to the greater access these women have to health facilities and higher socio-economic level of the urban sample in our study. The women with low socio-economic-status (SES) compared to medical, social, and emotional support have disadvantages which may lead to stress and thus need extra resources in order to cope with (48, 49).
This study results indicated that the prevalence rate among urban women was slightly lower than that of the rural ones. Also, this study verified the established PPD risk factors’ relationship with urban and rural women including the psychosocial factors. Additional urban and rural-specific factors contributing to PPD development include social isolation for urban women and medical ill-health and low social status for rural women requiring specific intervention. While urban area- dwelling women may benefit from support, public health programs should target rural women to improve their lifestyles and increase their socio-economic status. PPD screening by health care providers taking the distinguishing factors among rural and urban women into consideration will provide significant psychological benefits for the women.
Some caution has to be taken in this study using self-reported screening tools without being diagnostically confirmed. However, EPDS is a screening tool with the best sensitivity and specificity.
