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

Table 6 Moderator analysis for school level and program intensity for studies reporting continuous and categorical measures

	*Studies reporting continuous measures*							*Studies reporting categorical measures*
	k	$\bar{g}$	*95% CI*	Q	df	I ²	*Total between Q*	k	$\bar{OR}$	*95% CI*	Q	df	I ²	*Total between Q*
School level:							0.80							0.00
Junior high school	7	0.12***	0.05-0.19	14.41*	6	58.42%		8	0.91	0.77-1.07	25.24***	7	72.26%
High school	4	0.35	− 0.15-0.85	143.91***	3	92.92%		4	0.91	0.80-1.03	2.93	3	0.00%
Program intensity:							0.07							0.09
Medium (6 to 10 hours)	7	0.23	− 0.00-0.46	180.11***	6	96.67%		3	0.90	0.76-1.07	0.47	2	0.00%
High (11 to >15 hours)	3	0.20***	0.13-0.26	1.34	2	0.00%		12	0.93	0.82-1.06	36.16***	11	69.58%

Note. Mixed effect analysis. k = number of studies; $\bar{g}$ = mean Hedges’g; $\bar{OR}$ = 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.

ISSN: 1747-597X