Table 5.
Classification Table for combined Trail Making B (seconds) and Recognition Discriminability performances at ascending levels of dementia probability.
| Prob event | Correct | Incorrect | Percentages | Predicted TMT B | Predicted CERAD Recognition | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Event | Non-event | Event | Non-event | Correct | Sensitivity | Specificity | False Pos. | False Neg. | |||
| 0.30 | 22 | 139 | 10 | 8 | 89.9% | 73.3% | 93.3% | 31.3% | 5.4% | 148 | 8.8 |
| 0.35 | 22 | 140 | 9 | 8 | 90.5% | 73.3% | 94.0% | 29.0% | 5.4% | 157 | 8.6 |
| 0.40 | 20 | 141 | 8 | 10 | 89.9% | 66.7% | 94.6% | 28.6% | 6.6% | 167 | 8.4 |
| 0.45 | 19 | 142 | 7 | 11 | 89.9% | 63.3% | 95.3% | 26.9% | 7.2% | 177 | 8.2 |
| 0.50 | 18 | 145 | 4 | 12 | 91.1% | 60.0% | 97.3% | 18.2% | 7.6% | 186 | 8.1 |
| 0.55 | 18 | 146 | 3 | 12 | 91.6% | 60.0% | 98.0% | 14.3% | 7.6% | 196 | 7.9 |
| 0.60 | 17 | 146 | 3 | 13 | 91.1% | 56.7% | 98.0% | 15.0% | 8.2% | 206 | 7.7 |
| 0.65 | 17 | 147 | 2 | 13 | 91.6% | 56.7% | 98.7% | 10.5% | 8.1% | 216 | 7.5 |
| 0.70 | 17 | 148 | 1 | 13 | 92.2% | 56.7% | 99.3% | 5.6% | 8.1% | 225 | 7.3 |
| 0.75 | 16 | 148 | 1 | 14 | 91.6% | 53.3% | 99.3% | 5.9% | 8.6% | 235 | 7.2 |
| 0.80 | 13 | 148 | 1 | 17 | 89.9% | 43.3% | 99.3% | 7.1% | 10.3% | 245 | 7.0 |
| 0.85 | 10 | 149 | 0 | 20 | 88.8% | 33.3% | 100.0% | 0.0% | 11.8% | 255 | 6.8 |
| 0.90 | 8 | 149 | 0 | 22 | 87.7% | 26.7% | 100.0% | 0.0% | 12.9% | 264 | 6.6 |
Note. Prob level = probability of dementia case. TMT B = Trail Making B time in seconds. CERAD Recognition (Discriminability) = true positives − false positives: # correct Yes responses − (10 − # correct No responses).