Table 7 Mean (95% confidence interval and sample size) likelihood ratings for using cannabis, methamphetamine or ecstasy in the next 12 months for the intervention and control groups on each survey occasion

Intention to use cannabis in the next 12 months

Control

0.82

0.92

0.93

0.95

(0.74-0.90)

(0.80-1.04)

(0.79-1.07)

(0.81-1.09)

(n = 827)

(n = 579)

(n = 448)

(n = 403)

Intervention

0.56

0.62

0.72

0.61

(0.48-0.64)

(0.54-0.70)

(0.62-0.82)

(0.51-0.71)

(n = 903)

N = 627

(n = 614)

(n = 570)

Intention to use methamphetamine in the next 12 months

Control

0.41

0.52

0.45

0.49

(0.35-0.47)

(0.44-0.60)

(0.35-0.55)

(0.39-0.59)

(n = 827)

(n = 577)

(n = 447)

(n = 403)

Intervention

0.29

0.34

0.36

0.36

(0.23-0.35)

(0.28-0.40)

(0.28-0.44)

(0.28-0.44)

(n = 902)

(n = 625)

(n = 614)

(n = 569)

Intention to use ecstasy in the next 12 months

Control

0.50

0.63

0.63

0.62

(0.44-0.56)

(0.53-0.73)

(0.53-0.73)

(0.50-0.74)

(n = 823)

(n = 577)

(n = 445)

(n = 402)

Intervention

0.39

0.40

0.49

0.46

(0.33-0.45)

(0.32-0.48)

(0.40-0.56)

(0.38-0.54)

(n = 905)

(n = 625)

(n = 614)

(n = 569)