In this cross-sectional epidemiological study, we found that the prevalence of depressive symptoms in middle and high school students in Taizhou was 17.72%. This is lower than the figures found in the other two studies among primary school students (22.6%) (12) and high school students (43.7%) (13) in China after the outbreak of COVID-19. However, the two studies were either conducted in Hubei province or included a large number of participants in Hubei province where the infection rate of COVID-19 was highest in China. The studies among general population in China reported that young people and students had higher levels of depression and experienced a greater psychological impact of the pandemic (16, 17). It is also notable that the prevalence of depression in our sample was much higher in adolescents with poor parent-child relationship (52.38%) than those with good or normal relationship (16.30%). This result is consistent with previous studies which found that poor parent-child relationship and growth in family conflict increased the risk of adolescent depressive symptoms (18, 19).
The results of our study provide substantial support for findings of associations between study-relevant problems and depressive symptoms, including having difficulty in studying at home, dislike of remote learning, and excessive screen entertainment time. These associations were independent of sociodemographic and pandemic risk factors. One apparent question concerns how these study problems adversely affect adolescent mental health. Students who had difficulty in studying at home may worry about their academic performance. A large number of studies have shown that adolescents’ poor academic performance was closely associated with a high prevalence of depression (20–22). Remote learning has been reported to have several disadvantages, e.g. lack of self-discipline and self-motivation, harder to understand content when not face-to-face with teachers, and sense of isolation (23), which could harm mental health. Excessive screen use displaces time participating in healthier activities (24), imposes too much upward social comparison through social media (25, 26), and immerses adolescents in negative information consistent with their biased cognitions (26). Our study also found that as the number of study problems increased, adolescent depressive symptoms also increased. Thus, the accumulation of difficulty in studying at home, dislike of remote learning and excessive screen entertainment time is related to more severe depressive symptoms in adolescence.
In terms of the moderating effect of parent-child relationship on the associations between study problems and depressive symptoms, our results indicated that study problems due to school closures were particularly problematic for adolescents who had a poor relationship with the mother or father. Although previous studies have reported the separate effects of study problems and parent-child relationship on adolescent depressive symptoms (21, 26, 27), our study adds an important component by suggesting that the combination of the two substantially increased risk for triggering or precipitating depressive symptoms. Study problems and parent-child relationship have been associated with personal qualities such as self-esteem, which is closely related to the development of depression, suggesting that impaired self-esteem may underlie both types of difficulties (18, 26). Additionally, during the experience of study problems, adolescents may rely on their relationship with mother or father for security and reassurance, which then offsets their emotional disturbances (28). However, poor parental interaction styles, e.g. being highly critical, frequent child comparison, discouraging expression of opinions and invalidating ideas, may become potent stressors for students who have already experienced study difficulties (29). Moreover, our results indicate that, in addition to mother-child relationship, the role of fathers was important as well, since perception of the father-child relationship exerted a moderating effect on the relationship between study problems and depressive symptoms.
Due to the COVID-19 epidemic, schools at all levels were shut down in China and adolescents’ lifestyles have greatly changed thereafter. Although education authorities have developed online courses and other learning materials, the various restrictions imposed on daily life such as isolation at home and the potential adverse influence on academic development have posed a major threat to adolescents’ mental health (30). This study built on previous literature by examining three types of study problems in relation to depressive symptoms during school closures. Our findings also expanded previous work by suggesting the parent-child relationship as an important moderator that can help explain the transmission of study difficulties into the development of depression.
Several limitations of our study deserve comment. First, the cross-sectional design makes it impossible to test the direction of causality. Covariates at one time point do not take into account cumulative or past exposure, although difficulty in study at school before the pandemic was included in the models. Second, our study is unable to investigate the long-lasting impact of school closures on psychological wellbeing. Longitudinal studies are needed to better understand the longer-term consequences of COVID-19 on mental health for children and adolescents, and to determine the mechanisms that explain the occurrence of psychological problems, including changes in psychological, physiological and structural risk factors (31). Third, the level of depressive symptoms using self-report measure might not be consistent with the evaluation of mental health professionals.