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Table 4 Mean knowledge and attitude scores (95% confidence intervals and sample size) for the intervention and control groups over time

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
Cannabis Knowledge a Control 8.81 9.25 9.14 9.51
(8.63-8.98) (9.04-9.46) (8.87-9.41) (9.24-9.78)
(n = 826) (n = 576) (n = 448) (n = 403)
Intervention 8.69 10.76 10.42 10.39
(8.52-8.86) (10.58-10.94) (10.22-10.62) (10.17-10.61)
(n = 902) (n = 627) (n = 612) (n = 570)
Psycho-stimulants knowledge a Control 8.49 9.08 8.89 9.34
(8.31-8.67) (8.86-9.30) (8.60-9.18) (9.05-9.63)
(n = 823) (n = 577) (n = 449) (n = 403)
Intervention 8.45 10.46 10.25 10.28
(8.27-8.63) (10.26-10.66) (10.03-10.47) (10.04-10.52)
(n = 899) (n = 627) (n = 613) (n = 569)
Cannabis Attitude b Control 8.86 8.71 8.61 8.85
(8.62-9.10) (8.46-8.96) (8.32-8.90) (8.54-9.16)
(n = 826) (n = 578) (n = 445) (n = 403)
Intervention 8.13 8.04 8.30 7.95
(7.93-8.33) (7.80-8.28) (8.05-8.55) (7.70-8.20)
(n = 905) (n = 626) (n = 612) (n = 568)
Psycho-stimulants Attitude b Control 9.36 9.55 9.34 9.68
(9.14-9.58) (9.30-9.80) (9.05-9.63) (9.37-9.99)
(n = 824) (n = 577) (n = 445) (n = 403)
Intervention 8.93 8.88 8.96 8.74
(8.71-9.15) (8.63-9.13) (8.71-9.21) (8.49-8.99)
(n = 904) (n = 626) (n = 614) (n = 568)
  1. aKnowledge scores can range from 0–15; with a higher score reflecting greater knowledge.
  2. bAttitude scores range from 4–20; with a higher score reflecting a more positive attitude towards the use of drugs.