Kappa Statistics for Common Psychiatric Diagnoses After Motor Vehicle Accidents
| Specific Psychiatric Diagnosis | Diagnosis in Any of 148 Report Pairs n (%*) | κ for Opposing Adversarial Role n = 97 Pairs | κ for Same Adversarial Role n = 51 pairs† |
|---|---|---|---|
| Traumatic brain injury | 36 (12) | .31 | .61 |
| Post-traumatic stress disorder | 103 (35) | .27 | .26 |
| Depressive disorders‡ | 88 (30) | −.12 | .29 |
| Other anxiety disorders | 61 (21) | −.10 | .38 |
| Pain-related disorder | 24 (8) | .26 | .43 |
| Adjustment disorder | 25 (8) | .18 | .19 |
| Pathological grief | 11 (4) | .18 | .00 |
| Any mental disorder (includes others, n = 5) | 250 (84) | .09 | .74 |
| Average κ for all disorders | − | .14 | .31 |
* Total exceeds 100% due to multiple diagnoses.
† Six of 51 report pairs lacked statistical independence. An analysis that excluded all the report pairs from claims with three reports from the same side found a minimally changed agreement for traumatic brain injury (κ = .62), post traumatic stress disorder (κ = .31), depression (κ = .34), other anxiety disorders (κ = .34), and any mental disorder (κ = .68).
‡ Major depression, dysthymia and other depressive diagnoses.