Table 2.

LCMM model statistics

Between-model comparison
	Log likelihood	NPMa	BIC	Class 1b	Class 2b	Class 3b	Class 4b
2 Classes	−185.89	12	424.22	40.5%	59.5%
3 Classes	−169.81	17	413.89	26.6%	12.7%	60.7%
4 Classes	−159.67	22	415.47	7.6%	26.6%	11.4%	54.4%

Within the three-class model: fixed effects allowing for cubic time (t) trends
	n (%)		Coefficient	SE	Wald	p
Class 1	21 (26)	t	8.47	3.06	2.78	0.0055
		t2	32.88	5.51	5.97	<0.0001
		t3	0.13	1.84	0.07	0.9441
Class 2	10 (13)	t	−40.52	3.46	−11.69	<0.0001
		t2	−34.27	3.95	−8.67	<0.0001
		t3	−12.14	1.62	−7.51	<0.0001
Class 3	48 (61)	t	4.29	2.52	1.71	0.0878
		t2	−17.07	4.02	−4.25	0.0002
		t3	−3.97	1.36	−2.92	0.0035

Within the three-class model: mean of posterior probabilities (%) in each class
	Class 1	Class 2	Class 3
Class 1 (n = 21)	91	4	5
Class 2 (n = 10)	8	85	7
Class 3 (n = 48)	4	1	95

^aNumber of model parameters.

^bPosterior proportion for each class.