Table 1 Prevalence of risk behaviours by gender at age 14 and age 16

Regular smoking

4.5 (3.8, 5.2)

7.3 (6.5, 8.1)

15.1 (14.0, 16.4)

19.4 (18.0, 20.9)

Regular alcohol use

8.2 (7.4, 9.1)

7.4 (6.6, 8.3)

21.4 (20.0, 22.8)

17.8 (16.5, 19.1)

Ever tried cannabis

10.4 (9.5, 11.4)

8.9 (8.1, 9.8)

29.6 (28.2, 31.2)

26.5 (25.1, 28.0)

Delinquency

34.2 (32.7, 35.7)

23.2 (21.9, 24.5)

27.3 (25.8, 28.8)

16.4 (15.3, 17.6)

Drinking and Smoking

1.6 (1.3, 2.0)

2.0 (1.6, 2.4)

7.3 (6.5, 8.2)

8.6 (7.7, 9.6)

Reg. alcohol use and tried cannabis

2.9 (2.4, 3.4)

2.8 (2.3, 3.4)

13.0 (11.9, 14.2)

11.4 (10.4, 12.6)

Smoking and tried cannabis

2.8 (2.4, 3.3)

4.0 (3.5, 4.6)

11.4 (10.4, 12.5)

13.6 (12.6, 14.8)

Delinquency and reg. alcohol use

5.1 (4.6, 5.8)

4.6 (4.0, 5.2)

11.2 (10.2, 12.3)

7.7 (6.8, 8.6)

Delinquency and smoking

3.8 (3.2, 4.5)

5.2 (4.6, 6.0)

9.3 (8.4, 10.4)

8.0 (7.1, 8.9)

Delinquency and drugs

7.8 (7.0, 8.6)

6.0 (5.4, 6.8)

15.8 (14.6, 17.1)

10.3 (9.3, 11.4)

Two or more risk behaviours

11.5 (10.6, 12.6)

11.0 (10.1, 11.9)

25.6 (24.2, 27.1)

21.9 (20.5, 23.4)