Table 1.

Patterns of drinking and drug use, and problematic alcohol and drug use (CRAFFT-positive) in adolescents born from 1993–1995, stratified for gender

	Total sample % (95% CI)	Born 1995 % (95% CI)	Born 1994 % (95% CI)	Born 1993 % (95% CI)	OR for age trend (95% CI)	p Value
Never consumed alcohol (% yes)
Girls	20.7 (19.6 to 21.8)	31.4 (29.4 to 33.5)	19.4 (17.6 to 21.4)	6.3 (5.1 to 7.7)	0.42 (0.38 to 0.47)	<0.001
Boys	27.1 (25.7 to 28.4)	39.7 (37.4 to 42.1)	26.4 (24.2 to 28.7)	7.6 (6.1 to 9.4)	0.41 (0.37 to 0.45)	<0.001
Ever tried illicit drugs (% yes)
Girls	8.8 (8.1 to 9.6)	6.1 (5.1 to 7.3)	8.2 (7.0 to 9.6)	13.7 (11.9 to 15.6)	1.57 (1.39 to 1.77)	<0.001
Boys	12.5 (11.5 to 13.5)	10.8 (8.5 to 11.2)	10.2 (8.8 to 11.9)	18.5 (16.3 to 21.0)	1.37 (1.22 to 1.54)	<0.001
90th centile alcohol consumption* (% yes)
Girls	7.7 (6.9 to 8.6)	6.0 (4.8 to 7.4)	7.7 (6.4 to 9.2)	9.7 (8.2 to 11.5)	1.30 (1.13 to 1.51)	<0.001
Boys	7.4 (6.5 to 8.4)	5.9 (4.6 to 7.6)	5.9 (5.5 to 8.5)	9.6 (7.9 to 11.6)	1.31 (1.10 to 1.55)	0.002
Frequent intoxication (>10; % yes)†
Girls	20.5 (19.4 to 21.6)	10.6 (9.3 to 12.0)	19.7 (17.9 to 21.7)	36.1 (33.6 to 38.8)	2.20 (2.01 to 2.41)	<0.001
Boys	21.3 (20.1 to 22.6)	10.7 (9.3 to 12.3)	21.9 (19.9 to 24.1)	37.1 (34.2 to 40.1)	2.21 (2.00 to 2.44)	<0.001
CRAFFT-positive (≥2; % yes)
Girls	23.3 (22.2 to 24.5)	20.0 (18.3 to 21.8)	22.4 (20.5 to 24.4)	29.5 (27.1 to 32.1)	1.29 (1.19 to 1.40)	<0.001
Boys	20.3 (19.1 to 21.5)	15.8 (14.1 to 17.6)	19.3 (17.4 to 21.4)	29.0 (26.3 to 31.8)	1.47 (1.34 to 1.62)	<0.001

N=9203 (girls n=4995, boys n=4208).

95 CIs in parentheses.

CRAFFT: screening tool for identification of problematic alcohol and drug use among adolescents.

*Only includes those who have tried alcohol (n=7031).

†Only includes those with valid response on frequency of intoxication (n=9056).