Table 2. IRT Mixture Analyses of the Pain Item Bank.

								Class proportions*
K	P	LL	BIC	LR	VLMR p-value	BLRT p-value	Entropy	C1	C2	C3
1	177	-43285.9	87884					1.00
2	354	-41715.4	86056	3141	.000	.000	.86	.59	.41
3	531	-40858.6	85654	1713	.000	.000	.83	.27	.30	.43

Notes. N = 1,660. K = Number of latent classes in the model. P = number of parameters. LL = log likelihood. BIC = Bayesian Information Criterion. LR = Likelihood ratio of GRM and 2-, and 3-class LVMMs. VLMR = Vuong-Lo-Mendel-Rubin likelihood ratio test p-value. BLRT = Bootstrapped likelihood ratio test p-value. C1-C3 = classes 1 through 3.

* Probability of latent class membership predicted by the model.