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Table 5 Intervention effects for studies reporting continuous measures for frequency and quantity of alcohol use

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

 

Frequency of Alcohol Use

Quantity of Alcohol Use

 

k

N

g ¯

95% CI

Q

df

I 2

k

N

g ¯

95% CI

Q

df

I 2

Weekly drinking

0

-

-

-

-

-

-

3

3570

0.13*

0.01-0.25

3.98

2

49.70%

Monthly drinking

2

2119

0.07

−0.05-0.20

1.76

1

43.18%

2

4838

0.13

−0.09-0.35

1.81

1

44.69%

Lifetime drinking

2

3536

0.10

−0.06-0.27

4.25

1

76.45%

3

2216

0.50

−0.18-1.17

88.75***

2

97.75%

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

ISSN: 1747-597X