Psychometric Properties of Crafft in Screening for Substance Use Among Adolescents in Youth Correctional Institution
| Score | Sensitivity | Specificity | PPV | NPV | LR Positive | 95% CI | Posterior Probability | 95% CI | LR Negative | 95% CI | Posterior Probability | 95% CI |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| >1 | 0.913 | 0.812 | 0.875 | 0.866 | 4.856 | 2.25–10 | 59% | 40%–74% | 0.107 | 0.01–0.92 | 3% | 0%–21% |
| >2 | 0.870 | 0.812 | 0.869 | 0.813 | 4.628 | 2.11–10 | 57% | 38%–74% | 0.160 | 0.03–0.89 | 4% | 1%–21% |
| >3 | 0.478 | 0.875 | 0.846 | 0.538 | 3.824 | 1.19–12 | 53% | 26%–78% | 0.597 | 0.31–1.14 | 15% | 8%–25% |
| >4 | 0.261 | 0.937 | 0.856 | 0.468 | 4.143 | 0.71–24 | 55% | 17%–87% | 0.789 | 0.53–1.18 | 19% | 13%–20% |
NB: PPV is positive predictive value.
NPV is negative predictive value.
LR is likelihood ratio.