Clustering of smoking, alcohol drinking and cannabis use in adolescents in a rapidly developing country

BMC Public Health

Table 1 Prevalence (percent with their 95% confidence intervals) of students reporting risk behaviors, by sex and age

	Age	11–13 years		14 years		15–17 years		Total
		%	95% CI	%	95% CI	%	95% CI	%	95% CI
Boys	n	257		160		203		620
	Ever smoking	46	38 - 54	53	45 - 61	67	60 - 73	54	50 - 59
	Smoking in the past month	27	20 - 35	24	18 - 31	38	30 - 45	30	26 - 34
	Drinking in the past month	45	38 - 59	40	35 - 46	63	56 - 69	49	45 - 54
	Ever drunkenness	40	33 - 47	44	35 - 53	58	50 - 66	47	42 - 61
	Ever cannabis	15	10 - 22	15	11 - 21	29	23 - 37	20	17 - 22
	Cannabis in the past year	15	10 - 19	12	8 - 18	26	20 - 33	17	15 - 20
Girls	n	274		193		187		654
	Ever smoking	30	24 - 36	44	36 - 52	56	50 - 62	41	38 - 45
	Smoking in the past month	15	10 - 22	23	18 - 29	28	22 - 35	21	18 - 25
	Drinking in the past month	41	34 - 48	47	39 - 55	58	49 - 65	48	43 - 52
	Ever drunkenness	35	29 - 42	44	37 - 51	52	45 - 60	43	39 - 47
	Ever cannabis	6	4 - 9	6	3 - 12	16	12 - 21	9	7 - 11
	Cannabis in the past year	6	4 - 10	5	2 - 11	12	9 - 18	8	6 - 10

ISSN: 1471-2458