Table 2.
Summary statistics for the predictive variables
| Variable | Category | Admission (n = 1,207) | 2-year responders (n = 531) | 2-year complete cases (n = 411) | |||||
|---|---|---|---|---|---|---|---|---|---|
| na | Mean | SD | na | Mean | SD | Mean | SD | ||
| General health at admission | NA | 1,198 | 47.8 | 22.0 | 526 | 49.6 | 22.1 | 49.1 | 21.9 |
| General health improvement during stay | NA | 1,025 | 5.4 | 24.6 | 517 | 6.9 | 23.4 | 6.7 | 23.7 |
| Pain at admission | NA | 1,174 | 55.7 | 25.2 | 511 | 52.5 | 25.9 | 53.1 | 25.2 |
| Pain decrease during stay | NA | 981 | −5.6 | 22.9 | 490 | −5.6 | 24.1 | −6.0 | 23.9 |
| HADS anxiety | NA | 1,196 | 9.1 | 4.5 | 526 | 8.6 | 4.4 | 8.6 | 4.4 |
| HADS depression | NA | 1,196 | 7.4 | 4.5 | 525 | 6.9 | 4.3 | 7.0 | 4.3 |
| SF-36 physical summary score | NA | 1,151 | 33.3 | 7.0 | 503 | 33.3 | 7.1 | 32.9 | 6.8 |
| SF-36 mental summary score | NA | 1,151 | 37.8 | 9.1 | 503 | 39.0 | 9.1 | 39.1 | 9.1 |
| IES-R avoidance | NA | 1,174 | 11.5 | 10.4 | 517 | 10.8 | 10.6 | 11.1 | 10.6 |
| IES-R intrusion | NA | 1,173 | 12.5 | 11.2 | 517 | 11.2 | 10.9 | 11.6 | 10.9 |
| IES-R hyper-arousal | NA | 1,164 | 10.8 | 8.6 | 513 | 10.0 | 8.4 | 10.4 | 8.5 |
| Frequency | % | Frequency | % | Frequency | % | ||||
|---|---|---|---|---|---|---|---|---|---|
| Perceived severity of injury | Severe to very severe | 1,207 | 753 | 62.2 | 531 | 312 | 58.8 | 248 | 60.3 |
| Very light to moderate | 457 | 37.8 | 219 | 41.2 | 163 | 39.7 | |||
| Expected outcome | Deterioration or no improvement | 1,207 | 381 | 31.5 | 531 | 146 | 27.5 | 114 | 27.7 |
| Soon recovered or getting better | 829 | 68.5 | 385 | 72.5 | 229 | 72.3 |
aAll predictors could not be assessed for all patients due to missing values