. Author manuscript; available in PMC: 2015 Mar 1.

Published in final edited form as: J Res Adolesc. 2013 Feb 25;24(1):117–130. doi: 10.1111/jora.12030

Table 5.

Two-Part Semicontinuous Growth Model for Marijuana Use: Random Effects

	B	S.E.
Correlations
Pt. 1 Intercept with pt. 2 intercept	0.41^*	0.20
Residual variance
Quantity of use	2.41^***	0.39
Pt. 1 intercept	3.58^***	1.12
Pt. 2 intercept	2.36^***	0.48
R-Square
Use grade 9	0.77^***	0.05
Use grade 10	0.73^***	0.05
Use grade 11	0.68^***	0.06
Use grade 12	0.65^***	0.06
Quantity of use grade 9	0.68^***	0.06
Quantity of use grade 10	0.66^***	0.05
Quantity of use grade 11	0.65^***	0.05
Quantity of use grade 12	0.66^***	0.06
Pt. 1 intercept	0.68^***	0.07
Pt. 2 intercept	0.54^***	0.10

p < .05.

^**

p < .01.

^***

p < .001.