Table 1.

Characteristics of participants having used psychoactive substances in the previous 12 months (n = 17 565)

Characteristics	Total		Male		Female		P
	n (%)	95% CI	n (%)	95% CI	n (%)	95% CI
Substance use
Lifetime regular alcohol use	5708 (31.9)	30.7 to 33.1	3285 (35.0)	33.4 to 36.6	2423 (28.5)	26.8 to 30.3	<0.001
Number of illicit drugs used (≥2)	7737 (45.8)	44.5 to 47.2	3723 (43.1)	41.5 to 45.0	4014 (48.7)	46.9 to 50.5	<0.001
Mental health
Attention-deficit disorder with or without hyperactivity	2878 (17.7)	16.8 to 18.8	1760 (20.7)	19.4 to 22.1	1118 (14.5)	13.3 to 15.9	<0.001
Anxiety disorder	2045 (12.2)	11.5 to 12.9	714 (8.0)	7.2 to 8.9	1331 (16.7)	15.5 to 18.0	<0.001
Depression	1427 (9.2)	8.5 to 9.9	564 (7.3)	6.4 to 8.2	863 (11.3)	10.2 to 12.5	<0.001
Social competency
Low self-esteem	3717 (22.7)	21.8 to 23.7	1420 (16.9)	15.7 to 18.3	2297 (29.0)	27.5 to 30.5	<0.001
Low self-control	6166 (37.7)	36.6 to 38.9	3387 (39.5)	38.0 to 41.3	2779 (35.7)	34.1 to 37.5	0.001
Low self-efficacy	4238 (25.5)	24.5 to 26.6	1821 (21.6)	20.3 to 22.9	2417 (29.9)	28.4 to 31.5	<0.001
Family domain
Low parental supervision	6176 (37.7)	36.5 to 38.9	3567 (42.1)	40.4 to 43.7	2609 (32.8)	31.4 to 34.4	<0.001
Low social support	777 (4.6)	4.1 to 5.2	378 (4.4)	3.8 to 5.1	399 (4.8)	4.1 to 5.6	0.39
Low participation in family life	2948 (18.4)	17.5 to 19.5	1383 (16.8)	15.6 to 18.1	1565 (20.2)	18.9 to 21.7	<0.001
Peer domain
Low social support and affection from friends	620 (3.5)	3.1 to 4.0	434 (4.8)	4.1 to 5.4	186 (2.1)	1.7 to 2.6	<0.001
Low prosocial behaviours	613 (3.6)	3.1 to 4.0	447 (5.0)	4.3 to 5.8	166 (2.0)	1.6 to 2.4	<0.001