Prevalence of bedtime delay and its influencing factors in school-age students
Objective To estimate the prevalence of bedtime delay and its related influencing factors among school-aged children,and to provide reference for promoting the sleep health of school-aged children.Methods A total of 2761 children aged 7-9 years in 10 primary in Bao'an District,Shenzhen participated in the study from May to June 2020.Basic characteristics,life style,and their parents'characteristics of students were obtained by a questionnaire sur-vey.Sleep characteristics were obtained by Pittsburgh Sleep Quality Index.Associations of factors related to bedtime delay were analyzed by multiple logistic regressions.Results Among 2761 children aged 7-9 years,38.54％(1064/2761)of them slept later than 10 o'clock at night,and 73.85％(2039/2761)of them had sleep duration less than 10 hours.By lo-gistic regression analysis,when compared with school-age children whose parents were junior college educated or below,video time＜1 h/d and outdoor exercise time ≥0.5 h/d,school-aged children whose father with college degree or above,whose mother with college degree or above,video time≥1 h/d and outdoor exercise＜0.5 h/d had increased risk of late sleep,the OR values were 1.455(95％CI:1.218-1.738),1.257(95％CI:1.049-1.507),1.391(95％CI:1.189-1.627)and 1.36(95％CI:1.09-1.70),respectively.In combined analysis adjusted by video time and outdoor exercise time,school-age children with video time ≥1 h/d and outdoor exercise＜0.5 h/d had an increased OR value of 1.814(95％CI:1.326-2.482).Conclusion The longer screen time and the less outdoor exercise time will increase the risk of late sleep in school-age children.
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