Table 3.

Estimated class prevalences and response probabilities from a three class model of underage problem drinking

	Response probability (S.E.)
	Class 1	Class 2	Class 3
Class probabilities (prevalence)	0.43	0.30	0.27
Drinking behaviors
1. Drank at least 6 days past month	0.016 (0.003)	0.066 (0.010)	0.610 (0.024)
2. Binge drinking past 2 weeks	0.110 (0.011)	0.350 (0.032)	0.977 (0.003)
3. Got drunk at least 2−3 days a month during past year	0.118 (0.013)	0.518 (0.028)	0.960 (0.011)
Alcohol-related problems
1. Drove after drinking	0.030 (0.007)	0.064 (0.016)	0.342 (0.020)
2. Passed out or unable to remember what happened	0.032 (0.004)	0.509 (0.037)	0.638 (0.017)
3. Had headache or hangover	0.226 (0.023)	0.802 (0.025)	0.791 (0.016)
4. Social consequences	0.076 (0.011)	0.395 (0.027)	0.508 (0.019)

	Mean	S.D.	Range	Mean	S.D.	Range	Mean	S.D.	Range
Drinking behaviors (max = 3)	0.2	0.5	0−2	0.9	0.6	0−2	2.5	0.5	2−3
Alcohol-related problems (max = 4)	0.3	0.5	0−2	1.8	0.7	1−4	2.3	0.9	0−4
Total (max = 7)	0.6	0.6	0−2	2.7	0.7	2−5	4.9	1.1	3−7