The Journal of orthopaedic and sports physical therapy
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Low back pain is, in large part, a subjective illness. Clinicians must use patient descriptions of the severity and location of low back pain and how it responds to various activities and positions to make diagnostic and treatment decisions. Therefore, it is important to understand how reliably patients describe these aspects of low back pain. ⋯ 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 good test-retest reliability: 1) visual analogue scale = .66-.93, 2) pain drawing = .58-.94, and 3) pain response to activity and position questionnaire = .46-.89. The results of this study suggest that, although there is some variability in how consistently patients report various aspects of low back pain, the reliability of these pain measures is sufficient to permit their use in making clinical decisions and measuring treatment outcomes.