Table 5.
Sensitivity, Specificity, Positive Predictive Value (PPV), and Negative Predictive Value (NPV) of the ADHD Credibility Index (ACI) and CAARS Infrequency Index (CII) in the Detection of Simulated ADHD, Non-Credible Adults with ADHD, and Overreport on CAARS DSM Scales
| Base Rate | Group | |||
|---|---|---|---|---|
| Simulation | Non-Credible ADHD | Overreport | ||
| ACI | ||||
| Sensitivity | 30.34% | 0.0% | 38.34% | |
| Specificity | 98.50% | 94.74% | 98.81% | |
| PPV | 10 | 69.20% | 0.0% | 78.13% |
| 20 | 83.49% | 0.0% | 88.94% | |
| 30 | 89.66% | 0.0% | 93.23% | |
| 50 | 95.29% | 0.0% | 96.98% | |
| NPV | 10 | 92.71% | 89.50% | 93.52% |
| 20 | 84.98% | 79.12% | 86.50% | |
| 30 | 76.74% | 68.85% | 78.90% | |
| 50 | 58.58% | 48.65% | 61.58% | |
| CII | ||||
| Sensitivity | 46.28% | 27.27% | 64.53% | |
| Specificity | 95.09% | 69.00% | 96.86% | |
| PPV | 10 | 51.17% | 8.90% | 69.57% |
| 20 | 70.22% | 18.03% | 83.73% | |
| 30 | 80.16% | 27.38% | 89.82% | |
| 50 | 90.41% | 46.80% | 95.37% | |
| NPV | 10 | 94.09% | 89.52% | 96.09% |
| 20 | 87.62% | 79.14% | 91.61% | |
| 30 | 80.51% | 68.88% | 86.44% | |
| 50 | 63.90% | 48.69% | 73.20% | |
Participants were classified as Overreporters if their T-scores on any CAARS DSM Scale were ≧ 80