Landmark T et al. – Compared with the longitudinal classification, a cross–sectional measure of moderate pain or more during the last week on the SF–8 scale presented a sensitivity of 82% and a specificity of 84%, and a sensitivity of 80% and a specificity of 90% when combined with a 6–month recall question. Thus pain reporting in the general population is stable and cross–sectional measures may give valid prevalence estimates of chronic pain.Methods
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