Table 3.

Exploratory analyses: within-group and between-group comparisons of growth rate (slopes)

	Non-IS Group				IS Group				Difference between IS and Non-IS
Outcome	Pre-test to post-test	Post-test to follow-up	Change in slopes	Overall time effect	Pre-test to post-test	Post-test to follow-up	Change in slopes	Overall time effect	Pre-test to post-test	Post-test to follow-up
	Effect size (p-value)	Effect size (p-value)	Effect size (p-value)	p-value	Effect size (p-value)	Effect size (p-value)	Effect size (p-value)	p-value	Effect size (p-value)	Effect size (p-value)
Primary outcomes
SEI	.48 (.06)	−.33 (.17)	−.81 (.05)*	.13	1.19 (.00)	.05 (.78)	−1.14 (.01)*	<.001*	.76 (.04)*	.43 (.24)
IJA	.66 (.10)	−.34 (.42)	−1.00 (.05)*	.13	1.59 (.00)	.34 (.41)	−1.25 (.02)*	<.001*	.93 (.11)	.68 (.25)
SPA	.56 (.19)	−.18 (.68)	−.74 (.25)	.40	1.39 (.00)	.22 (.62)	−1.18 (.07)	.01*	.83 (.17)	.41 (.52)
Secondary outcomes
EL T	.89 (.02)*	−.10 (.73)	−.99 (.02)*	.01*	1.49 (.00)*	−.01 (.97)	−1.50 (<.001)*	.00*	.60 (.13)	.09 (.83)
VR T	.20 (.44)	−.23 (.37)	−.43 (.25)	.51	1.04 (.00)*	−.34 (.20)	−1.37 (<.001)*	.00*	.84 (.02)*	−.10 (.78)