Table 6.

Random Coefficients Model Estimate for Passage Comprehension W Score

Effect	Estimate	Effect Size	t or Z value*	p value|
Fixed Effects	475.26		235.37	< .0001
Intercept
Condition1	4.38	0.288	2.09	0.0383
Linear time	9.56	0.578	4.19	< .0001
Linear × condition	−1.28	0.124	−0.90	0.3703
Quadratic	−5.88	0.864	−6.26	< .0001
Selection2	13.22	0.850	6.16	< .0001
Linear × selection	−3.09	0.295	−2.14	0.0340
Grade level4	2.23	0.146	1.06	0.2907
Linear × grade level	−13.02	1.256	−9.10	< .0001
Random Effects
Intercept	146.72		5.68	<.0001
Covariance between intercept and time	−56.20		−4.19	<.0001
Linear time	45.97		3.52	0.0004
Residual	105.18		8.80	<.0001

^*t value for fixed effects, Wald Z values for random effects

¹Condition coded 1 for intervention 0 for control

²Selection coded 1 for aggression 0 for reading

⁴Grade level coded 1 for 2^nd & 3^rd 0 for Kindergarten & 1^st