The findings of the current study showed that about a quarter of the students in the study had moderate to severe mental problems and the most prevalent problems were related to social functioning. Also, mean scores of mental health and high - risk behaviors of the subjects were 31.06 ± 16.44 (of maximum 84), and 18.03 ± 3.72 (of maximum 78), respectively. Moreover, female students who never talked to their parents were more at risk of mental disorders in all four studied dimensions. Moreover, non - participation in decision - making process was associated with social dysfunction; relationship with the opposite gender was associated with depression, and sleep disorders with anxiety, social dysfunction, and depression. In addition, the high - risk behaviors of adolescents had a statistically significant relationship with mental health, family variables, relationship with opposite gender, and nighttime sleep as well as.
Reviewing American literature from 2005 to 2011 showed that 11.3% of children under 17 had an advanced emotional or behavioral problem and at least one mental problem was observed in about half of 13 - 18 - year - old adolescents and severe mental problems in 28% of adolescents. The prevalence of behavioral problems in the age group of 12 - 17 years was 5.7%, and depression and anxiety 8.1% and 6.6%, respectively (
24). The prevalence of mental problems in French adolescents was 12.5% (
25) and the results of a study in Vietnam showed that anxiety 22.8% of adolescents had anxiety, 41.1% depression, and 26.3% suicide attempt (
26).
Furthermore, the prevalence of anxiety and depression were 19.01% and 19.74% in Iranian female students, respectively (
12). Results of other studies on students in Iran also showed the highest prevalence in social functioning, followed by anxiety, depression, and physical problems. The overall prevalence of mental problems is reported 39% - 62% in different regions of Iran (
13,
27). Consistent with other studies, the present study indicated that the lowest level of mental health was in social functioning scale, making up more than a quarter of students studied. The results of the study by D’Arcy and Siddique (
31), on the social functioning of a group of Canadian adolescents was also in line with the results of the current study.
The findings suggested that mental disorders of adolescents could be associated with a wide range of features including physical and cognitive health, mental functioning, social environment, family features, and stressful life events (
32). When there is a warm relationship between parents and adolescents, a healthy environment is created to develop adolescents (
15,
33). The results of the current study demonstrated that the less the quality of the relationship between parents and children, the more the symptoms of depression and anxiety in children (
34,
35) and poor social support was associated with greater risk of mental problems in adolescents. Families with more intimate relationships and less struggles possess adolescents with higher mental health (
36,
37). Investigating Iranian adolescents indicated a significant relationship between their mental health and family communication patterns (
38). Family communication patterns have a significant relationship with anxiety and depression in adolescents and orientating family dialogue is a significant negative predictor of anxiety and depression in children (
39). The current study indicated that adolescents that never talk to their parents and do not participate in decision - making process were more at risk of mental disorders. Also, adolescent with high - risk behaviors in their families (e.g., addiction, smoking, etc.), experiences of being abused by parent, or live with other relatives were more at risk of high - risk behaviors; therefore, when the family environment provides more comfortable conditions for conversation about a wide range of subjects, children can achieve personal and intellectual maturity as well as healthiness.
In recent years, there was a rapid increase in friendship with the opposite gender among adolescents and youth of Iran. This is while friendship with the opposite gender is not accepted in Iranian culture. Such relationships are associated with mental and physical problems and conflict with parents, and are not suggested (
40). In addition, a romantic relationship in adolescence is a predictor of anxiety, depression, and anger, particularly among females (
41). The current study also identified increased risk of depression and high - risk behaviors among females reporting relationships with the opposite gender. In contrast, some studies show an increase in pleasure, well - being, and mental health, and a decrease in high - risk behaviors in students managing friendship with opposite gender (
42).
Findings of the current study showed a significant relationship between high - risk behaviors and mental health of the subjects. Indeed, with a decrease in mental health, participation in high - risk behaviors increased. The study on American high school students revealed that stress and depression were associated with increased drug use, violence, assault, unsafe sex, and unhealthy diet (
16). Also, reduction of negative emotions such as depression and anxiety was among the causes of adolescent smoking; in fact, smoking is more common in people with depression and mood disorders (
43). On the other hand, studies illustrated that females were more inclined to inner destructive behaviors such as anxiety, depression, and suicide attempt. Female participation in high - risk behaviors had an emotional nature related to their stress and depression as well (
44).
In line with the results of the current study, previous studies showed that sleep difficulties and hours of sleep were significant predictors of a number of substance - related problems (
45) and mental problems (
46). It might be useful to educate adolescents about the importance of sleeping time and the potential consequences of sleep hours on mental health and risky behaviors.
5.1. Conclusions
Therefore, it can be concluded that authorities of educational affairs and families should consider that a significant number of students lack mental health and its continuation would have negative consequences for society and families. Therefore, raising awareness about sleep hygiene and mental health, supplying healthy recreational facilities, establishing counseling and planning centers, and planning for prevention, are amongst the most important measures to prevent mental disorders and decrease high - risk behaviors in adolescents. Therefore, basic planning and policymaking are required to improve mental health of students.
5.2. Limitation
Potential bias: Subjects of the current study were limited to the public schools and grade 10, as well as female gender; therefore, they were not representatives of all adolescents in this age group. Missing values were only 2% of the participants for each variable. In addition, data collection was based on a self - administered questionnaire completed anonymous.