Sleep chronotype of middle school students in Shenzhen and its association with mental health
Objective To investigate the sleep chronotype of middle school students in Shenzhen and its correlation with mental health status,so as to provide a reference for early prevention of psychological problems among middle school students.Methods In October 2021,a stratified cluster sampling and convenience sampling method was used to select 4 029 students from 3 junior high schools and 3 high schools in Shenzhen as the study subjects.Sleep chronotypes and mental health status were investigated by Morningness/Eveningness Questionnaire 5(MEQ-5)and Brief Instrument on Psychological Health of Youths,and the correlation between the two was examined using Spearman correlation and partial correlation.Results Among the middle school students,the majority 66.79％(2 811 students)had an intermediate sleep chronotype.The proportions of moderate morning types,moderate eve-ning types,definite evening types,and definite morning types were 14.97％(630 students),14.49％(610 students),2.40％(101 students),and 1.35％(57 students),respectively.The detection rates of mental health issues among students with definite eve-ning,moderate evening,intermediate,moderate morning,and definite morning sleep chronotypes were 43.56％,28.36％,12.63％,7.14％,and 22.81％,respectively,with statistically significant differences(x2=196.00,P＜0.01).The results of partial correlation analysis indicated a negative correlation between students'sleep chronotype scores and the number of mental health symptoms(r=-0.21,P＜0.01).Conclusions The majority of middle school students in Shenzhen report intermediate sleep chronotype,but those with evening chronotypes have the highest proportion of mental health issues.It is suggested that intervention measures of im-proving students'sleep chronotypes may help reduce the risk of mental health problems.
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