Table 2

Pooled prevalence of passive smoking by gender, area and age, in the community population aged 15 years and older in China

			Heterogeneity			Egger's test
Subgroup	Number of studies	Prevalence % (95% CI)	χ²	p Value	I², %	t	p Value
Gender
Male	39	43.4 (38.9 to 48.0)	7386.26	<0.001	99.5	3.29	0.002
Female	43	47.8 (43.9 to 51.6)	16 726.46	<0.001	99.7	−0.39	0.701
Area
Rural	20	43.5 (37.5 to 49.5)	12 889.39	<0.001	99.9	−0.41	0.688
Urban	21	48.6 (42.9 to 54.2)	7321.31	<0.001	99.7	0.54	0.596
Age
≥60	24	35.1 (31.8 to 38.3)	1378.78	<0.001	98.3	1.44	0.164
15–59	22	47.1 (43.2 to 50.9)	6681.43	<0.001	99.7	1.17	0.257