From: Guided web-based treatment program for reducing cannabis use: a randomized controlled trial
Intention-to-treat analyses (n = 303) | |||||||||||||
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Outcome | Pre M (SD) or n (%) | Post M (SD) or n (%) | Outcome modelling | ||||||||||
Intervention | Control | Intervention | Control | Type | Intercept | Time | Group | Time × group | |||||
Number of days without cannabis use (past week) | 1.60 | (2.03) | 1.38 | (1.94) | 4.16 | (2.74) | 3.27 | (2.70) | Poisson | B = 0.32 (SE = 0.11, p < .001) | B = 0.85 (SE = 0.14, p < .001) | B = 0.14 (SE = 0.15, p = .35) | B = 0.09 (SE = 0.19, p = .63) |
Gram cannabis (past week) | 5.98 | (5.64) | 6.87 | (7.99) | 2.30 | (2.92) | 4.06 | (6.69) | Poisson | B = 1.93 (SE = 0.09, p < .001) | B = − 0.45 (SE = 0.11, p < .001) | B = − 0.14 (SE = 0.12, p = .25) | B = − 0.27 (SE = 0.18, p = .12) |
Number of DSM-5 cannabis use disorder criteria | 7.93 | (2.22) | 8.18 | (2.05) | 5.02 | (2.61) | 5.74 | (2.69) | Gaussian | B = 8.18 (SE = 0.17, p < .001) | B = − 2.17 (SE = 0.28, p < .001) | B = − 0.25 (SE = 0.25, p = .31) | B = − 0.61 (SE = 0.48, p = .2) |
CAST score | 14.05 | (4.33) | 14.07 | (4.31) | 8.26 | (5.10) | 9.73 | (5.37) | Gaussian | B = 14.07 (SE = 0.35, p < .001) | B = − 3.8 (SE = 0.53, p < .001) | B = − 0.02 (SE = 0.49, p = .97) | B = − 1.63 (SE = 0.9, p = .07) |
Help-seeking (n, %) | 17 | (11.26) | 19 | (12.5) | 12 | (24) | 17 | (21.79) | Binomial | B = − 1.95 (SE = 0.25, p < .001) | B = 0.56 (SE = 0.28, p = .05) | B = − 0.12 (SE = 0.36, p = .74) | B = 0.25 (SE = 0.49, p = .61) |
Number of standard glasses of alcohol (past week) | 6.29 | (8.03) | 5.62 | (8.11) | 4.28 | (5.11) | 5.44 | (9.45) | Poisson | B = 1.73 (SE = 0.12, p < .001) | B = − 0.09 (SE = 0.2, p = .65) | B = 0.11 (SE = 0.16, p = .47) | B = − 0.26 (SE = 0.25, p = .3) |
SCS score | 48.87 | (13.26) | 49.05 | (14.52) | 54.10 | (14.70) | 54.77 | (15.84) | Gaussian | B = 49.05 (SE = 1.17, p < .001) | B = 4.83 (SE = 1.34, p < .001) | B = − 0.17 (SE = 1.59, p = .91) | B = 0.17 (SE = 2.22, p = .94) |
MADRS score | 21.62 | (8.91) | 20.92 | (9.79) | 16.78 | (10.99) | 16.22 | (11.27) | Gaussian | B = 20.92 (SE = 0.79, p < .001) | B = − 4.11 (SE = 0.94, p < .001) | B = 0.69 (SE = 1.07, p = .52) | B = − 0.67 (SE = 1.68, p = .69) |
GAD-7 score | 9.28 | (5.50) | 8.67 | (5.34) | 6.60 | (5.57) | 6.36 | (5.52) | Gaussian | B = 8.67 (SE = 0.43, p < .001) | B = − 1.97 (SE = 0.52, p < .001) | B = 0.61 (SE = 0.62, p = .33) | B = − 0.19 (SE = 0.85, p = .82) |
Excluding participants who sought other treatment (n = 267) | |||||||||||||
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Pre M (SD) or n (%) | Post M (SD) or n (%) | Outcome modelling | |||||||||||
Intervention | Control | Intervention | Control | Type | Intercept | Time | Group | Time × group | |||||
Number of days without cannabis use (past week) | 1.52 | (1.99) | 1.29 | (1.83) | 4.26 | (2.68) | 3.16 | (2.48) | Poisson | B = 0.32 (SE = 0.12, p = .01) | B = 0.83 (SE = 0.15, p < .001) | B = 0.05 (SE = 0.17, p = .76) | B = 0.27 (SE = 0.21, p = .2) |
Gram cannabis (past week) | 5.82 | (5.53) | 6.99 | (8.18) | 2.03 | (2.60) | 4.05 | (6.96) | Poisson | B = 1.95 (SE = 0.1, p < .001) | B = − 0.42 (SE = 0.13, p < .001) | B = − 0.12 (SE = 0.13, p = .36) | B = − 0.42 (SE = 0.19, p = .02) |
Number of DSM-5 cannabis use disorder criteria | 7.79 | (2.26) | 8.04 | (2.03) | 4.42 | (2.46) | 5.87 | (2.50) | Gaussian | B = 8.11 (SE = 0.18, p < .001) | B = − 2.06 (SE = 0.3, p < .001) | B = − 0.26 (SE = 0.26, p = .32) | B = − 1.36 (SE = 0.52, p = .01) |
CAST score | 13.62 | (4.26) | 13.90 | (4.24) | 7.79 | (5.07) | 9.80 | (5.10) | Gaussian | B = 14.05 (SE = 0.38, p < .001) | B = − 3.45 (SE = 0.56, p < .001) | B = − 0.15 (SE = 0.53, p = .78) | B = − 1.9 (SE = 0.99, p = .06) |
Number of standard glasses of alcohol (past week) | 6.48 | (7.97) | 5.62 | (8.08) | 4.92 | (5.42) | 4.38 | (5.48) | Poisson | B = 1.65 (SE = 0.13, p < .001) | B = − 0.22 (SE = 0.16, p = .17) | B = 0.18 (SE = 0.17, p = .27) | B = 0.09 (SE = 0.22, p = .69) |
SCS score | 49.18 | (13.67) | 49.74 | (14.57) | 56.97 | (13.14) | 55.93 | (15.97) | Gaussian | B = 49.78 (SE = 1.27, p < .001) | B = 5.19 (SE = 1.64, p < .001) | B = − 0.54 (SE = 1.71, p = .75) | B = 2.45 (SE = 2.67, p = .36) |
MADRS score | 21.17 | (9.03) | 20.48 | (9.58) | 14.29 | (9.98) | 16.20 | (11.91) | Gaussian | B = 20.36 (SE = 0.86, p < .001) | B = − 3.22 (SE = 1.1, p < .001) | B = 0.93 (SE = 1.14, p = .41) | B = − 3.3 (SE = 1.93, p = .09) |
GAD-7 score | 8.84 | (5.43) | 8.17 | (5.08) | 5.61 | (5.18) | 5.80 | (5.12) | Gaussian | B = 8.09 (SE = 0.44, p < .001) | B = − 2.11 (SE = 0.62, p < .001) | B = 0.89 (SE = 0.63, p = .16) | B = − 0.76 (SE = 0.96, p = .43) |