Skip to main content

Table 3 Overall effect sizes and combined outcomes by different time points presented for studies reporting continuous and categorical measures

From: Effectiveness of school-based preventive interventions on adolescent alcohol use: a meta-analysis of randomized controlled trials

 

Studies reporting continuous measures

  

Studies reporting categorical measures

 
 

K

N

g ¯

95% CI

Q

df

I 2

K

N

OR ¯

95% CI

Q

df

I 2

Overall effect size

12

16279

0.22**

0.08-0.36

184.11***

11

94.03%

16

23010

0.94

0.85-1.04

38.08***

15

60.61%

Alcohol use:

              

 <3 months

8

6617

0.10**

0.03-0.17

10.66

7

34.35%

3

5763

1.18*

1.00-1.40

0.82

2

0.00%

  4-12 months

8

10479

0.27*

0.03-0.52

239.19***

7

97.07%

11

16409

0.86*

0.75-0.99

29.57***

10

66.18%

  >13 months

3

6617

0.37

−0.14-0.88

113.88***

2

98.24%

10

18177

0.95

0.89-1.02

9.525

9

5.52%

  1. Note. Random effect model. k = number of studies; N = total number of participants; g ¯ = mean Hedges’g; OR ¯ = mean Odds Ratio; Q = test of heterogeneity; 95% CI = confidence interval; df = degrees of freedom; I2 = proportion of observed dispersion. *p < .05 **p < .01 ***p < .001.