Table 1.

Sociodemographic characteristics and risky behaviour of adolescent girls by grade

CHARACTERISTIC	GRADE 10 N = 386 %	GRADE 11 N = 386 %	GRADE 12 N = 361 %	P VALUE
Lived with both parents	65.8	66.1	66.4	.986
Mother had postsecondary education	50.7	59.2	54.4	.067
Smoked every day in past month	14.4	18.4	16.1	.307
Used marijuana ≥20 times in life	15.4	23.1	23.3	.009
Had ≥5 drinks on >5 days in past month	4.3	5.9	8.2	.089
Had suicidal thoughts in past year	20.3	20.0	17.3	.516
Had suicide plan in past year	16.4	13.2	11.7	.158
Made suicide attempt in past year	6.8	7.5	4.5	.204
At risk of depression	27.8	24.0	25.6	.483
Ever had vaginal intercourse	37.7	51.3	59.8	<.0001
Had vaginal intercourse before age 15	15.0	10.9	10.5	.108
Perceived self as underweight	15.4	17.4	10.0	.013
Perceived self as about the right weight	53.6	47.8	50.1	.263
Perceived self as overweight	31.0	34.8	39.8	.041