Table 3.

Prevalence and item-response probabilities in Latent Substance Use Status

	Mild Alcohol Use	Alcohol and Moderate Marijuana Use	Polysubstance Use
Prevalence of statuses
2011(Time2)
Total Sample	443 (45.0%)	366 (37.2%)	175 (17.8%)
Female	260 (47.3%)	212 (38.5%)	78 (14.2%)
Male	183 (39.4%)	154 (35.5%)	97 (22.4%)
2012(Time3)
Total Sample	377 (38.3%)	412 (41.9%)	195 (19.8%)
Female	237 (43.1%)	236 (42.9%)	77 (14.0%)
Male	140 (32.2%)	176 (40.6%)	118 (27.2%)
2013(Time4)
Total Sample	354 (36.0%)	437 (44.4%)	193 (19.6%)
Female	225 (40.9%)	255 (46.4%)	70 (12.7%)
Male	129 (29.7%)	182 (42.0%)	123 (28.3%)
Item-response probabilities each latent class
Alcohol use
1=No	0.778	0.126	0.051
2=YES	0.222	0.874	0.949
Tobacco use
1=No	0.990	0.809	0.323
2=YES	0.010	0.191	0.677
Marijuana use
1=No	0.972	0.542	0.099
2=YES	0.028	0.458	0.901
Prescription drugs
1=No	0.995	0.973	0.440
2=YES	0.005	0.027	0.560
Other drugs
1=No	0.990	0.961	0.413
2=YES	0.010	0.039	0.587

Note: Boldface numbers represent moderate to high probabilities.