Table 1.

Baseline characteristics among boys and girls aged 11-17 years

	Boys (n = 677)*		Girls (n = 740)*
	%	95% CI	%	95% CI	P
Smoked ≥ 1 cigarette in past 30 days	22.0	18.7-25.3	10.6	8.3-12.9	0.000
Drank alcohol ≥ 1 times in past 30 days	59.7	55.6-63.9	56.2	52.3-60.0	ns
Used cannabis ≥ 1 time in past 30 days	19.2	16.1-22.2	3.7	2.3-5.1	0.000
Felt sad or hopeless ≥ 2 weeks in a row in past 12 months	27.7	24.2-31.2	35.0	31.5-38.5	0.004
Often felt lonely in past 12 months	10.4	8.1-12.8	15.2	12.6-17.7	0.009
Was so worried about something that could not sleep at night in past 12 months	10.0	7.7-12.2	12.1	9.7-14.5	ns
Seriously considered attempting suicide in past 12 months	15.9	13.1-18.7	18.4	15.6-21.2	ns
Parents rarely/never check homework	37.9	34.0-41.7	38.6	35.0-42.2	ns
Parents rarely/never understand problems	37.5	33.6-41.4	39.0	35.4-42.7	ns
Parents rarely/never know what child is doing	38.0	34.1-41.9	29.8	26.4-33.2	0.002
Pocket money ≥ 25 rupees per day	23.5	20.2-26.9	21.7	18.6-24.7	ns
School absence without permission ≥ 1 day in past 30 days	39.1	35.2-43.0	25.0	21.8-28.2	0.000
Has less than 2 close friends	19.1	16.0-22.1	21.9	18.9-25.0	ns

*Missing values vary from 8 to 252 according to the selected baseline characteristics.