This study was a large sample epidemiological survey of university students in northeastern China. The study investigated the main risk factors for a depressive state among college students in northeastern China. Our findings revealed significant differences between college students with and without depression in terms of place of residence, family income, parents’ education, physical punishment during childhood, adolescent health-related risk behaviors, and adolescent life satisfaction. Further exploration revealed that health-compromising behavior, suicidal and self-injury behaviors, school satisfaction, friendship satisfaction, freedom satisfaction, and environmental satisfaction were independent risk factors for a depressed state among college students.
Our study found that the higher the health-compromising behavior score of college students, the more severe was their depression. Health-related risk behaviors included aggressive violence, disciplinary disruption, suicidal self-injury, health-compromising behaviors, unprotected sexual behaviors, smoking, and drinking[21]. In this study, we found that college students with depression had higher total health-compromising behavior scores, higher total scores for violent aggression, more suicidal self-injurious behaviors, were more likely to break discipline, and smoked and drank alcohol more. Further study found that health-compromising behavior is a risk factor for a depressed state among college students. An unhealthy diet and lack of physical activity also negatively affect health and are therefore considered health risk behaviors [22]. Health promotion and incorporating health-protective behaviors into people's lifestyles have gone a long way in recent years to improve individuals' overall health and well-being. Studies have found that college students are at increased risk of developing unhealthy diets and lifestyles [23]. Several studies supported our results that a lack of physical activity increases health risk [24]. Prolonged sitting can increase the risk of developing chronic conditions like obesity, metabolic syndrome, and depression [25]. In addition, as shown in the literature, skipping breakfast is common among college students. Mansouri et al. [26] reported that regular breakfast consumption was negatively associated with overweight and obesity among college students. Poor eating behaviors among college students may increase the risk of developing mood disorders, and understanding their overall eating behaviors may be necessary to reduce this risk. A logical explanation may be that when college students with depression fail to follow general health advice pertaining to moderate eating or eating breakfast on time, they may not develop good eating habits, but instead overeat, diet excessively, or skip breakfast. A comparative study showed that students who perceived their health as good, very good, or excellent had healthier behaviors, and that university health and wellness initiatives should focus on the mental and physical health of college students to help them develop positive behaviors that affect overall health-related quality of life. Therefore, health-related risk behaviors should be a point of focus, as these will likely persist into adult life with various negative consequences.
Our findings showed that suicidal and self-injury behaviors were positively associated with a depressed state among college students. Previous studies have related depression with the severity of suicidal ideation in a sample of college students at high risk of suicidal behavior due to past suicide attempts[27]. This finding is consistent with the results of our study. Suicidal behavior among college students is associated with various factors such as psychopathology, stressful life events, personality traits, the rapid growth of higher education, and high expectations students must meet, all of which increase their psychological stress. Anxiety and despair due to the aforementioned factors can moderate the relationship between stress and depressive symptoms and promote the onset of depression[28]. The occurrence of suicidal behavior and depression may also be related to school belonging. A recent study showed that the interaction between loneliness and school belonging increased the risk of suicide and the resulting risk such as suicidal behavior and depression, which could serve as predictors[29]. These findings suggest that suicidal behavior and the occurrence of depression are closely related. Non-suicidal self-injury (NSSI) behavior among college students is a current social concern. One study showed that NSSI behavior has specific emotional characteristics such as eating disorders, depression, anxiety, and stress. Moreover, college students with prior experience of NSSI have fewer adaptive coping strategies when they encounter problems that may lead to emotional difficulties such as the emergence of a depressed mood, which supports our findings. The association between NSSI and depression may be closely related to neuroticism. Studies have shown that neuroticism significantly negatively predicts mood regulation, and positively predicts depression and NSSI [30]. Highly neurotic people are prone to negative emotions such as anger, shame, and guilt. When unable to deal with these emotions effectively, they seek mental stimulation by punishing themselves or through NSSI. Other negative emotions, especially depression, are also generated. NSSI behaviors and a depressed state in patients with high neuroticism are closely related [31]. Our findings suggest that we should be highly concerned about the possibility of depression among college students with a history of suicidal or self-injurious behavior.
Life satisfaction is a cognitive component of an individual's subjective well-being, and is closely related to the psychological health of college students [32]. Survey results regarding college students’ life satisfaction can significantly predict their social, behavioral, and psychological problems (depression and anxiety). The results of this study showed that the life satisfaction of college students with depression was significantly different from that of those who were not depressed in all six dimensions (friendship, family, school, academics, freedom, and environment) (Table 1, all p < 0.001) [33]. Consistent with the results of this study, a Chinese questionnaire survey of 439 college students aged 17–24 years found that life satisfaction was positively associated with self-esteem and social support and negatively associated with variables such as depression and suicidal ideation [34]. Similarly, a US study of 508 full-time undergraduate students aged 18–24 years found that life satisfaction was a significant independent predictor of depression. In addition, a study investigating 1,224 university students in Brazil during the COVID-19 pandemic found that depression and anxiety were negatively associated with life satisfaction, mental health, and adaptive coping styles, and positively associated with poor coping styles. Many results support a negative correlation between life satisfaction and depression [35, 36]. To explain this phenomenon, some scholars have proposed that the generation of depression and anxiety may be related to people's inability to satisfy their needs in valuable areas of their lives. As low satisfaction does not bring people happy emotions, this leads to depression [37]. In conclusion, effectively improving college students' life satisfaction is beneficial to their mental health and may help reduce their risk of depression. It is noteworthy that although an increasing number of studies link mental health and life satisfaction, few have refined the different dimensions of life satisfaction among college students. A logistic regression in this study revealed that school satisfaction, friendship satisfaction, freedom satisfaction, and environmental satisfaction were independent risk factors for a depressed state among college students. Note that this study did not find that family and academic satisfaction significantly predicted a depressed state among college students. This differs from the results of previous studies [38], which may be related to cultural differences. China tends to have a strict entrance scoreline for college students, but it is relatively easy to study after enrollment. However, in some Western countries, the opposite is true [39]. In addition, most of the residence patterns of Chinese university students are residential, and few students live with their families. When faced with more challenges and tasks, the emotional impact of family on them may be diluted. In conclusion, it is recommended that university health professionals have a targeted focus on college students’ life satisfaction and implement strategies and programs to reduce their depression.
Limitations of this study
This study has some limitations. First, it is cross-sectional and cannot infer an actual causal relationship. In the future, we could conduct a longitudinal follow-up study to clarify the results. Second, this study has many retrospective questions, and there may be recall bias when participants answer these types of questions, which may affect the final results. Third, some confounding factors were not included in this study, such as smoking frequency, alcohol use, and other factors that play an important role in depression. Fourth, we did not collect information on our participants’ health conditions such as the body mass index or any diseases. Thus, the findings of this study cannot be extended to all Chinese college students. Finally, this study did not include a healthy control group. Future studies including those with a longitudinal cohort should use a broader range of samples and collect more information on the aspects not covered here.