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*

SampleCut pointSensitivity (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 success74% (70 to 78)62% (58 to 66)1.950.42