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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.