Table 4.

Binge Drinking, Alcohol Abuse, and Other Drug Use.

	Sensitivity	Specificity	Efficiency	PPV*	NPV**
Alcohol Abuse||	0.79	0.75	0.76	0.49	0.92
12-Month Use of
Marijuana	0.57	0.74	0.68	0.56	0.75
Crack/Cocaine	0.67	0.67	0.67	0.22	0.94
Hallucinogen	0.76	0.63	0.64	0.04	0.99
Ecstasy	0.79	0.64	0.64	0.05	0.99
Heroin	0.53	0.63	0.63	0.03	0.98
Other Drug	0.47	0.63	0.62	0.08	0.95
Prescription Drug§	0.53	0.63	0.63	0.07	0.96

^||Positive endorsement of 1 of 4 DSM-IV symptoms of alcohol abuse, from CIDI.

^§Use of prescription drugs or pain killers in a way not prescribed by a doctor

Sensitivity: Proportion with alcohol abuse/current drug use correctly identified by binge drinking screener (True Positives/True Positives + False Negatives)

Specificity: Proportion without alcohol abuse/current drug use identified as such by binge drinking screener (True Negatives/True Negatives + False Positives)

Efficiency: Proportion correctly identified by test (True Positives + True Negatives/Total Population)

^*PPV (Positive Predictive Value): Proportion of those with alcohol abuse/current drug use who screen positive for binge drinking (True Positives/True Positives + False Positives); results vary based on prevalence of disease in population

^**NPV (Negative Predictive Value): Proportion of those without alcohol abuse/current drug use who screen negative for binge drinking (True Negatives/True Negatives + False Negatives); results vary based on prevalence of disease in population.