Skip to main content

Table 4 Observed means and outcome model parameters

From: Guided web-based treatment program for reducing cannabis use: a randomized controlled trial

Intention-to-treat analyses (n = 303)
OutcomePre M (SD) or n (%)Post M (SD) or n (%)Outcome modelling
InterventionControlInterventionControlTypeInterceptTimeGroupTime × 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)PoissonB = 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)PoissonB = 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 criteria7.93(2.22)8.18(2.05)5.02(2.61)5.74(2.69)GaussianB = 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 score14.05(4.33)14.07(4.31)8.26(5.10)9.73(5.37)GaussianB = 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)BinomialB = − 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)PoissonB = 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 score48.87(13.26)49.05(14.52)54.10(14.70)54.77(15.84)GaussianB = 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 score21.62(8.91)20.92(9.79)16.78(10.99)16.22(11.27)GaussianB = 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 score9.28(5.50)8.67(5.34)6.60(5.57)6.36(5.52)GaussianB = 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)
 Pre M (SD) or n (%)Post M (SD) or n (%)Outcome modelling
InterventionControlInterventionControlTypeInterceptTimeGroupTime × 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)PoissonB = 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)PoissonB = 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 criteria7.79(2.26)8.04(2.03)4.42(2.46)5.87(2.50)GaussianB = 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 score13.62(4.26)13.90(4.24)7.79(5.07)9.80(5.10)GaussianB = 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)PoissonB = 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 score49.18(13.67)49.74(14.57)56.97(13.14)55.93(15.97)GaussianB = 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 score21.17(9.03)20.48(9.58)14.29(9.98)16.20(11.91)GaussianB = 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 score8.84(5.43)8.17(5.08)5.61(5.18)5.80(5.12)GaussianB = 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)