Purpose: To examine the associations of excessive internet use with depression, anxiety, and sleep quality among high school students in northern Vietnam, a country experiencing rapid economic growth. Design and methods: A cross-sectional study was conducted in a high school in northern Vietnam from July to September 2019. Symptoms of depression and anxiety were respectively assessed using the Center for Epidemiological Studies Depression Scale and the Vietnamese Anxiety Scale. Sleep quality was measured using the Pittsburgh Sleep Quality Index. Internet use and demographic characteristics were obtained using structured questionnaires. A multiple logistic regression was performed. Results: In total, 678 participants with an average age of 16.1 (standard deviation 0.9) years were included. Nearly one-third of the adolescents (30.7%) exhibited excessive internet use (> 4 h/day), 19.6% experienced depressive symptoms, 14.5% presented anxiety symptoms, and 58.8% reported poor sleep quality. Compared to non-excessive internet users, excessive internet users (> 4 h/day) experienced significantly higher levels of depressive symptoms (p = .001), anxiety (p = .008), and poorer sleep quality (p < .001). Students who were female and with fair/poor self-rated health experienced higher depression, anxiety, and poor sleep quality (p < .05). After adjusting for demographic and health-related factors, students with excessive internet use were 58% more likely to experience poor sleep quality (odds ratio, 1.58, 95% confidence interval [1.06, 2.35]). Conclusions: Excessive internet use in Vietnamese high school students was significantly associated with poor sleep quality, but not with depression or anxiety.
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