Table 2. Meta-regression of course pass rates by moderating variables.

Variable	B	SEa	95% Confidence Intervals		Heterogeneity
			Lower Level	Upper Level	QM (df)	QE (df)
Pass Rate Variables (n)
Intercept	3.511	2.183	0.761	16.226	1.01 (3)	13.04 (5)**b
Small Classes (50)	0.921	3.019	0.106	8.030
Medium Classes (51–100)	0.672	1.742	0.227	1.994
Training	0.753	1.824	0.232	2.445

^aAbbreviations: SE = standard error, df = degrees of freedom; n = class sizes. Pass rate effect sizes are from odds ratio analysis. There were not enough studies to meta-analyze class sizes with more than 100 student enrollees.

^bStars represent conventional significance levels as follows

***p < 0.001.

**p < 0.01.

*p < 0.05.

+p < 0.1.