Skip to main content

Table 2 Liner mixed model analysis of outcome measures

From: Evaluation of the effects of a designated program on illegal drug cessation among adolescents who experiment with drugs

 

Regression coefficient

Standard error

t-value

p value

Stress management

 Group (intervention) a

−0.79

1.55

−0.51

0.619

 Time (T2) b

−1.27

1.22

−1.04

0.299

 Time (T3) b

1.54

1.08

1.42

0.157

 Group (intervention) × Time (T2) c

2.41

1.70

1.42

0.159

 Group (intervention) × Time (T3) c

7.35

1.51

4.87

<0.001

Refusal skills

 Group (intervention) a

−0.63

1.00

−0.63

0.532

 Time (T2) b

1.13

0.78

1.44

0.151

 Time (T3) b

1.56

0.71

2.20

0.030

 Group (intervention) × Time (T2) c

0.61

1.09

0.56

0.577

 Group (intervention) × Time (T3) c

2.09

0.99

2.10

0.038

Pros of drug use

 Group (intervention) a

2.51

3.14

0.80

0.433

 Time (T2) b

0.15

2.42

0.06

0.950

 Time (T3) b

1.41

2.36

0.59

0.553

 Group (intervention) × Time (T2) c

0.97

3.38

0.29

0.774

 Group (intervention) × Time (T3) c

−7.96

3.31

−2.41

0.017

Cons of drug use

 Group (intervention) a

1.35

2.44

0.55

0.586

 Time (T2) b

1.01

2.39

0.43

0.671

 Time (T3) b

5.74

2.09

2.75

0.007

 Group (intervention) × Time (T2) c

0.68

3.34

0.20

0.838

 Group (intervention) × Time (T3) c

3.98

2.92

1.37

0.174

Drug use resistance self-efficacy

 Group (intervention) a

−2.58

1.06

−2.45

0.017

 Time (T2) b

0.45

1.02

0.45

0.656

 Time (T3) b

0.85

0.80

1.06

0.292

 Group (intervention) × Time (T2) c

0.64

1.42

0.45

0.652

 Group (intervention) × Time (T3) c

3.47

1.12

3.09

0.003

  1. T1: Baseline, T2: The end of the main intervention, T3: After the booster intervention
  2. aReference group: Comparison group
  3. bReference group: T1
  4. cReference group: Group (comparison) × Time (T1)
  5. Liner mixed model was performed with group, time and group × time as fixed effects and subjects and schools as random effects