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Table 4 Intervention effects on adolescent alcohol use of combined time points for studies reporting categorical measures

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

 

Studies reporting categorical measures

 

k

N

OR ¯

95% CI

Q

df

I 2

Weekly drinking

6

10140

0.86***

0.78-0.95

3.71

5

0.00%

Monthly drinking

6

11544

0.92

0.75-1.12

22.05***

5

77.33%

Lifetime drinking

7

11725

1.04

0.93-1.17

11.02

6

45.53%

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