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. Author manuscript; available in PMC: 2011 Dec 1.

Published in final edited form as: J Drug Issues. 2010 Dec;40(1):155–172. doi: 10.1177/002204261004000109

Table 1.

Comparison of Conventional GCM and Alternative GCM for the MPP Randomized Prevention Intervention Trial

	Cigarette		Alcohol		Marijuana
	Model A¹	Model B¹	Model A	Model B	Model A	Model B
*Intercept*
Mean	11.486 (1.231)^**	15.001 (1.536)^**	2.965 (.499)^**	7.344 (1.024)^**	1.960 (.365)^**	4.498 (.750)^**
PROGRAM	−.631 (2.173)	−3.729(2.134)^†	−.719 (.942)	−3.109 (1.877)^†	−1.012 (.689)	−2.258 (1.370)^†
PUBLIC	7.856 (2.182)^**	3.989 (2.143)^†	2.030 (.946)^*	.665 (1.885)	1.238 (.692)^†	3.075 (1.375)^*
Baseline as a covariate	N/A	.888 (.133)^*	N/A	.651 (.274)^*	N/A	.295 (.268)
*Slope*
Mean	2.370 (.212)^**	2.060 (.315)^**	3.250 (.196)^**	2.962 (.223)^**	1.404 (.165)^**	1.122 (.192)^**
PROGRAM	−.470 (.369)	.177 (.555)	−.582 (.372)	−.086 (.431)	−.415 (.312)	−.012 (.328)
PUBLIC	−1.338 (.371)^**	−1.822 (.558)^**	−.562 (.373)	−.519 (.432)	.576 (.314 )^†	.021 (.329)
Baseline as a covariate	N/A	−.055 (.035)	N/A	−.072 (.063)	N/A	.266 (.064)^**
Model fit
Chi-square	30.966	19.064	43.764	21.443	54.171	19.669
df	17	14	17	14	17	14
P-value	0.020	0.163	0.001	0.091	0.001	0.141
CFI	0.891	0.948	0.500	0.956	0.745	0.944
RMSEA	0.142	0.106	0.175	0.056	0.223	0.113

Notes. 1. Model A: GCM with baseline as the initial status; Model B: GCM with baseline as a time-invariant covariate.

^**

significant at .01;

^*

significant at 0.05;

^†

significant at 0.10.