TEST-RETEST RELIABILITY OF PATIENT REPORTS OF LOW-BACK-PAIN

low back pain is, in large part, a subjective illness. Clinicians must use patient descriptions of the severity and location of low back pai n and how it responds to various activities and positions to make diag nostic and treatment decisions. Therefore, it is important to understa nd how reliably patients describe these aspects of low back pain. The purpose of this study was to determine the test-retest reliability of a visual analogue scale measure of pain intensity, a pain drawing meas ure of pain location, and the pain response to activity and position q uestionnaire. Fifty-three subjects (28 men and 25 women) with a mean a ge of 54.2 years were recruited from an outpatient orthopaedic clinic. They completed the visual analogue scale, pain drawing, and pain resp onse to activity and position questionnaire before and again immediate ly after seeing their physician. Thirty-three subjects also completed the visual analogue scale and pain drawing measure that evening and th e next morning. Test-retest reliability of the visual analogue scale a nd : pain drawing measure was examined using an intraclass correlation coefficient Reliability of each item on the pain response to activity and position questionnaire was examined by calculating an unweighted Cohen's kappa. Overall, the three pain measures demonstrated fair to g ood test-retest reliability: 1) visual analogue scale = .66-.93, 2) pa in drawing = .58-.94, and 3) pain response to activity and position qu estionnaire = .46-.89. The results of this study suggest that, althoug h there is some variability in how Consistently patients report variou s aspects of low back pain, the reliability of these pain measures is sufficient to permit their use in making clinical decisions and measur ing treatment outcomes.