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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

From: A universal harm-minimisation approach to preventing psychostimulant and cannabis use in adolescents: a cluster randomised controlled trial

   Baseline Post Five month follow-up 10 month follow-up
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)