Table 2.

Fit Statistics for Growth Mixture Models by Substance Use Outcome and Class Solution

Class solution	Log-likelihood	BIC	Entropy
Alcohol usea
1 class	−1001.48	2033.12	n/a
2 classes	−950.50	1949.27	0.73
3 classes	−933.07	1932.51	0.67
4 classes	−933.07	1950.60	0.60
Marijuana useb
1 class	−1014.53	2065.09	n/a
2 classes	−973.85	2001.74	0.68
3 classes	−964.52	2001.08	0.60
4 classes	−964.52	2019.10	0.68
Cigarette usec
1 class	−1146.85	2348.30	n/a
2 classes	−1107.80	2288.30	0.90
3 classes	−861.70	1814.32	0.87
4 classes	−850.51	1810.20	0.84

Note. n/a=not applicable.

^aPoisson distribution, linear model.

^bPoisson distribution, nonlinear model.

^cContinuous distribution, linear model.