Measures of validity for a clinical prediction rule developed from 7 baseline variables for predicting the 2 year work disability status in non-specific back pain*
| Sample | Cut point | Sensitivity (95% CI)† | Specificity (CI)† | +LR | −LR |
|---|---|---|---|---|---|
| *FAA = failure after attempt. Diagnostic terms defined in glossary; LRs calculated from data in article. | |||||
| †95% CIs provided by author. | |||||
| Validation set (n = 506) | Failure or FAA v success or partial success | 74% (70 to 78) | 62% (58 to 66) | 1.95 | 0.42 |