Table 2.

Trends in the prevalence of secondhand smoke exposure in any place (on ≥1 day during the past 7 days) by age, sex, residence, region, gross domestic product per capita category, and status of cigarette smoking among Chinese adolescents from 2013-2014 to 2019.

		Prevalence in 2013-2014, %	95% CI	Prevalence in 2019, %	95% CI	Absolute change in prevalence, %	95% CI
Overall		72.9	71.5 to 74.3	63.2	62 to 64.5	–9.8	–11.8 to –8.1
Grade
	Seventh	65.7	64 to 67.3	55.8	54 to 57.6	–10	–12.6 to –7.7
	Eighth	74.3	73.5 to 76.2	66.1	64.5 to 67.6	–8.3	–10.9 to –6.2
	Ninth	78.7	77.5 to 79.9	68.5	67.2 to 69.7	–10.3	–12.1 to –8.7
Sex
	Boys	75.5	74.4 to 77	65.4	64 to 66.7	–10.4	–12.3 to –8.7
	Girls	69.9	68.3 to 71.4	60.8	59.4 to 62.2	–9.2	–11.3 to –7.2
Residence
	Urban	74.4	73.3 to 75.6	63.5	61.7 to 65.3	–11	–13.3 to –8.9
	Rural	72.4	70.5 to 74.2	63.1	61.4 to 64.8	–9.4	–12 to –7
Region
	North	73.1	70.3 to 75.9	63	58.8 to 67.3	–10.1	–15.2 to –4.9
	East	68.9	66.8 to 71	59.9	57 to 62.9	–9	–12.6 to –5.4
	Central	75.9	73.9 to 78	64	61.5 to 66.4	–12	–15.2 to –8.8
	South	67.8	61.8 to 73.8	66.3	63.1 to 69.4	–1.7	–8.6 to 5.3
	Southwest	77.5	75.1 to 79.8	65.2	62.1 to 68.2	–12.5	–16.4 to –8.5
	Northwest	78.9	75.4 to 82.3	66.3	63.1 to 69.5	–12.6	–17.3 to –7.8
	Northeast	75.7	73.8 to 77.6	61.2	57.8 to 64.7	–14.5	–18.5 to –10.5
Gross domestic product per capita category
	Low	75.4	73.4 to 77.4	65.4	62.6 to 68.1	–10.1	–13.6 to –6.7
	Middle	75	73.4 to 76.6	64	62.3 to 65.7	–11.1	–13.5 to –8.8
	High	69	66.2 to 71.9	60.7	58.4 to 63.1	–8.3	–12 to –4.6
Current cigarette smoking
	No	71.5	70.1 to 72.9	61.9	60.6 to 63.3	–9.6	–11.1 to –8.1
	Yes	94.1	93.3 to 95	93.8	92.6 to 95	–0.5	–2 to 1.1