Table 3.

Correlations between study method characteristics and aggressive/disruptive behavior effect sizes for universal programs (N=77)

Method Variable	Correlation
Teacher reported outcome measure	0.07
Self-reported outcome measure	-0.23**
Number of items in outcome measure	-0.19*
Timing of measurement	-0.02
Cluster random assignment	-0.07
Non-random assignment	0.07
Pretest adjustment	-0.13
ES calculated with means/sds (vs. all other methods)	-0.05
Degree of estimation in ES calculation	-0.02
Attrition (% loss)	-0.13
Number of ES aggregated	-0.08

Note: weighted random effects analysis

^*p<0.10

^**p<0.05