Inter-rater reliability
| KOSCHI category | Description | Fleiss kappa statistic |
| 1 | Dead | N/A |
| 2 | Vegetative | 0.88 |
| 3a | Severe disability | 0.63 |
| 3b | 0.33 | |
| 4a | Moderate disability | 0.28 |
| 4b | 0.51 | |
| 5a | Good recovery | 0.53 |
| 5b | Intact recovery | 0.66 |
Kappa statistics by KOSCHI category. Inter-rater reliability exercises were performed only on survivors, hence there are no KOSCHI category 1 (“dead”) observations. Values calculated after omitting observer 2 show a qualitatively very similar pattern.