Table 6.

Correlations between study method characteristics and aggressive/disruptive behavior effect sizes for selected/indicated pull-out programs (N=108)

Method variable	Correlation
Teacher reported outcome measure	-0.00
Archival outcome measure	0.06
Observational outcome measure	-0.00
Number of items in outcome measure	-0.19*
Timing of measurement	0.07
Random assignment	-0.01
Pretest adjustment	-0.11
ES calculated with means/sds (vs. all other methods)	-0.09
Degree of estimation in ES calculation	-0.09
Attrition (% loss)	-0.22**
Number of ES aggregated	0.05

Note: weighted random effects analysis

^*p<0.10

^**p<0.05