The Workers' Compensation Board of British Columbia, Canada postulated that a comprehensive medical assessment would identify serious pathology after subacute work-related low back injury. However, they could not identify medical evaluation variables that would account for significant proportions of variance in return to work. The weight of evidence obtained in the study suggested to the researchers that injured workers' subjective interpretations and appraisals may be more powerful predictors of the course of postinjury recovery than exclusively medical assessments. Link