TABLE 1.

Estimated response probabilities (p) and class prevalences (π) for two-and-three class models of underage drinking

	Two-class model		Three-class model
	Class 1	Class 2	Class 1	Class 2	Class 3
Regular drinking	0.01	0.42	0.01	0.03	0.51
Binge drinking	0.15	0.85	0.10	0.30	0.93
Drunkenness	0.19	0.91	0.13	0.41	0.97
Drove after drinking	0.02	0.26	0.03	0.04	0.31
Passed out/forgot	0.26	0.85	0.02	0.72	0.80
Headache/hangover	0.51	0.88	0.33	0.86	0.82
Social problems	0.22	0.58	0.15	0.41	0.57
Class prevalence	0.60	0.40	0.36	0.33	0.31
AIC	47,265.5		47,208.9

AIC = Akaike information criteria.