How insomnia classification influences prevalence estimates and clinical comparisons in chronic musculoskeletal pain: a cross-sectional study.
BACKGROUND Insomnia is common in people with chronic musculoskeletal pain (CMP). However, insomnia is often operationalised in various way, impairing the comparability between studies and limiting clinical integration of findings. OBJECTIVES This secondary exploratory analysis of data from a pre-registered cross-sect...