Table 3.

Modeling of Knowledge Test Scores by Grade Level

	Pre- vs. Post-test Model N=1,128		Pre- vs. Post-test by Grade Level Model N=1,046
	b	SE	b	SE
Fixed Effects:
Intercept	3.68**	0.18	3.49**	0.19
Post-Score (vs. Pre-Score)	2.88**	0.06	2.92**	0.07
High School (vs. Middle School)	-	-	0.56**	0.16
Time × Grade-Level	-	-	−0.10	0.14
Akaike Information Criterion	8311.9		7696.8

^**p<0.001

Beta estimates (b) are unstandardized.