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A study of the validity of the scaled version of the General Health Questionnaire in paralysed spinally injured out-patients

Synopsis This study validates the GHQ-28 on a sample of paralysed, spinally injured outpatients under the care of the West Midlands Spinal Injuries Unit. The validity of the GHQ-28 was 0·83 (95% confidence interval: 0·70 to 0·93) using the Clinical Interview Schedule (CIS) as the validating criterion. The effectiveness of the GHQ-28 as a screening instrument using CIS 11/12 as case criterion, and thus a prevalence rate of 0·18, was judged by relative operating characteristic (ROC) analysis. The area under the ROC curve was 0·91±0·03. “Optimum’ discrimination occurred near GHQ 3/4 (0011 scoring scheme) giving a sensitivity of 0·81, a specificity of 0·82 and a misclassification rate of 18%.