Table 2.
Measurement performance of drug use assessments for adults with schizophrenia: SCID as criterion
| Measure |
SCID 1 Month Drug Abuse or Dependence
|
||||||
|---|---|---|---|---|---|---|---|
| Detection ratio | AUC (SE) | AUC 95%CI | Sensitivity | Specificity | Percent Classified Correctly | Cohen’s Kappa | |
| Self-report | |||||||
| Marijuana | 2.31† | .87 (.02) | .83–.91† | 86.0% | 88.4% | 88.2% | 0.46 |
| Cocaine | 1.80† | .87 (.03) | .82–.93† | 79.4% | 95.0% | 94.2% | 0.54 |
| Opiate | 2.80† | .67 (.13) | .39–.88 | 28.6% | 98.8% | 95.2% | 0.14 |
| Stimulant | 1.66 | .88 (.06) | .77–.99† | 77.8% | 99.0% | 96.8% | 0.59 |
| All tested drugs | 1.91† | .86 (.02) | .82–.89† | 85.1% | 86.0% | 85.9% | 0.51 |
| Urine | |||||||
| Marijuana | 1.20 | .74 (.03) | .68–.80† | 53.7% | 94.7% | 91.4% | 0.44 |
| Cocaine | 1.34 | .73 (.04) | .65–.81† | 50.0% | 95.9% | 93.6% | 0.40 |
| Opiate | 3.80† | .74 (.13) | .49–.99 | 50.0% | 98.3% | 98.1% | 0.17 |
| Stimulant | 0.50 | .71 (.08) | .55–.86† | 41.2% | 99.9% | 99.3% | 0.53 |
| All tested drugs | 1.34† | .73 (.02) | .68–.77† | 55.4% | 89.6% | 85.5% | 0.39 |
| Hair | |||||||
| Marijuana | 2.01† | .73 (.04) | .66–.80† | 58.3% | 88.5% | 86.1% | 0.32 |
| Cocaine | 3.31† | .85 (.03) | .78–.91† | 84.1% | 84.9% | 84.9% | 0.25 |
| Opiate | 5.20† | .74 (.16) | .42–1.00 | 50.0% | 97.5% | 97.3% | 0.11 |
| Stimulant | 2.17† | .87 (.07) | .74–.99† | 75.0% | 98.5% | 98.2% | 0.52 |
| All tested drugs | 2.48† | .75 (.02) | .70–.79† | 75.4% | 77.2% | 77.0% | 0.32 |
| Any laboratory test | |||||||
| Marijuana | 2.00† | .78 (.03) | .72–.83† | 65.7% | 89.3% | 87.4% | 0.38 |
| Cocaine | 3.32† | .78 (.03) | .72–.85† | 69.6% | 87.0% | 86.2% | 0.27 |
| Opiate | 6.60† | .77 (.12) | .54–.99 | 57.1% | 97.0% | 96.8% | 0.14 |
| Stimulant | 1.75† | .88 (.06) | .76–.99† | 76.5% | 98.8% | 98.6% | 0.55 |
| All tested drugs | 2.39† | .78 (.02) | .74–.81† | 76.3% | 78.6% | 78.4% | 0.34 |
†
=Bonferonni adjusted p-value (p<0.01)