Second-hand smoke exposure and related factors of non-smoking junior middle school students in Beijing from 2013 to 2021
Objective To analyze the second-hand smoke exposure and related factors of non-smoking junior middle school students in Beijing,so as to provide a data support for formulating tobacco control measures.Methods The multi-stage cluster ran-dom sampling method was used to select junior middle school students in Beijing.The valid data of 4 494,4 915 and 3 792 non-smoking middle school students were obtained from three waves of youth tobacco epidemic surveillance in 2013(September to Octo-ber),2019(August to November)and 2021(September to December)wave,respectively.The information was collected by the na-tional youth tobacco epidemic surveillance questionnaire.The complex sampling data analysis module of SPSS 21.0 was used to de-scriptive analysis and multivariate Logistic regression.Results The proportions of second-hand smoke exposure of non-smoking junior middle school students in the four types of places in the past 7 days in 2013,2019 and 2021 in Beijing were 76.4％,71.4％and 65.7％,respectively,with statistically significant differences(x2=126.10,P＜0.01).The proportions of that found someone smoking in the campus in the three waves of survey were 34.7％,27.9％and 21.1％(x2=209.78),the proportion of that found teachers smoking daily were 2.7％,1.8％and 1.3％(x2=22.14)(P＜0.01),respectively.Multivariate Logistic regression analysis showed both parents smoking(OR=8.47,95％CI=4.36-16.48),father smoking(OR=3.51,95％CI=2.75-4.49),and friends smoking(OR=1.88,95％CI=1.39-2.55)were the influencing factors of second-hand smoke exposure in four types of places of non-smoking junior middle school students in 2013.Both parents smoking(OR=2.37,95％CI=1.33-4.22),father smoking(OR=2.80,95％CI=2.33-3.37),friends smoking(OR=2.24,95％CI=1.71-2.92),and teaching the tobacco hazards in class(OR=0.77,95％CI=0.64-0.93)were the influencing factors of second-hand smoke exposure in four types of places for non-smoking mid-dle school students in 2019.Both parents smoking(OR=3.93,95％CI=2.29-6.75),fathers smoking(OR=3.30,95％CI=2.72-3.99),and teaching the tobacco hazards in the class(OR=0.81,95％CI=0.68-0.97)were the influential factor of second-hand smoke exposure in four types of places of non-smoking junior middle school students in 2021(P＜0.05).Conclusions The second-hand smoke exposure of non-smoking middle school students in Beijing has improved,but still is a high level.It is necessary to take corresponding measures to effectively protect non-smoking junior middle school students from the harm of second-hand smoke.
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