Table 3.
Contingency Tables of Patient Classifications by Chart Review and by the Two Algorithms
| Chart Review Classification | ||||
|---|---|---|---|---|
| ICD Algorithm | Likely PTSD |
Possible PTSD |
Likely not PTSD |
Total |
| Likely PTSD | 166 | 30 | 7 | 203 |
| Possible PTSD | 31 | 45 | 42 | 118 |
| Likely not PTSD | 1 | 9 | 154 | 164 |
| Total | 198 | 84 | 203 | 485 |
| Lasso Algorithm | ||||
| Likely PTSD | 188 | 38 | 7 | 233 |
| Possible PTSD | 2 | 7 | 2 | 11 |
| Likely not PTSD | 8 | 39 | 194 | 241 |
| Total | 198 | 84 | 203 | 485 |
| Lasso Algorithm | ||||
|---|---|---|---|---|
| ICD Algorithm | Likely PTSD |
Possible PTSD |
Likely not PTSD |
Total |
| Likely PTSD | 197 | 2 | 4 | 203 |
| Possible PTSD | 33 | 9 | 76 | 118 |
| Likely not PTSD | 3 | 0 | 161 | 164 |
| Total | 233 | 11 | 241 | 485 |
Note. Of the 500 charts reviewed by content experts, 15 participants could not be classified due to insufficient information, leaving a final chart review sample of n = 485.