Age 12 to 15 Years | Age 16 to 17 Years | Age 18 to 20 Years | ||||
---|---|---|---|---|---|---|
N = 79,170 | N = 42,356 | N = 48,460 | ||||
Se | Sp | Se | Sp | Se | Sp | |
Alcohol | ||||||
≥1 day | 1.00 | 0.87 | 1.00 | 0.63 | 1.00 | 0.46 |
≥2 days | 1.00 | 0.90 | 1.00 | 0.69 | 1.00 | 0.50 |
≥3 days | 1.00 | 0.92 | 1.00 | 0.73 | 1.00 | 0.54 |
≥12 days | 0.84 | 0.96 | 0.89 | 0.88 | 0.94 | 0.72 |
≥52 days | 0.40 | 0.99 | 0.48 | 0.96 | 0.65 | 0.88 |
≥270 days | 0.02 | 1.00 | 0.02 | 1.00 | 0.03 | 1.00 |
AUC (SE) | 0.98 (0.0003) | 0.93 (0.0006)* | 0.88 (0.0007)*† | |||
Cannabis | ||||||
≥1 day | 1.00 | 0.96 | 1.00 | 0.86 | 1.00 | 0.80 |
≥2 days | 1.00 | 0.97 | 1.00 | 0.88 | 1.00 | 0.83 |
≥3 days | 0.99 | 0.97 | 1.00 | 0.90 | 1.00 | 0.85 |
≥12 days | 0.90 | 0.99 | 0.94 | 0.95 | 0.96 | 0.92 |
≥52 days | 0.61 | 0.99 | 0.71 | 0.98 | 0.80 | 0.96 |
≥270 days | 0.12 | 1.00 | 0.20 | 1.00 | 0.31 | 0.99 |
AUC (SE) | 0.99 (0.0002) | 0.97 (0.0004)* | 0.96 (0.0004)*† | |||
Other Illicit Drugs | ||||||
≥1 day | 1.00 | 0.94 | 1.00 | 0.90 | 1.00 | 0.87 |
≥2 days | 0.92 | 0.96 | 0.95 | 0.93 | 0.97 | 0.89 |
≥3 days | 0.88 | 0.96 | 0.90 | 0.94 | 0.94 | 0.91 |
≥12 days | 0.69 | 0.97 | 0.71 | 0.96 | 0.76 | 0.95 |
≥52 days | 0.40 | 0.99 | 0.44 | 0.98 | 0.52 | 0.98 |
≥270 days | 0.08 | 1.00 | 0.13 | 1.00 | 0.16 | 1.00 |
AUC (SE) | 0.98 (0.0003) | 0.97 (0.0004)* | 0.97 (0.0004)*† |
Notes: Se = Sensitivity; Sp = Specificity; AUC = Area under Receiver Operating Characteristic (ROC) Curve for any symptom of DSM-IV Alcohol, Cannabis, or Other Drug Use Disorders; Se, sensitivity; Sp, specificity. Bolded screening cut-points are shown that have high values of sensitivity and specificity and minimize the number of different age- and substance-specific cut-points.
Frequency is coded as days of use in the past year.
χ2 test for independence (relative to age 12 to 15 years),
↵* P < .0001.
χ2 test for independence (comparing 16–17- and 18–20-year-olds),
↵† P < .0001.