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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)

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)

 

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)