II. Indices of pain intensity derived from ecological momentary assessments and their relationships with patient functioning: an individual patient data meta-analysis

Pain intensity is one of the core outcome measures in chronic pain research and practice. Even though the label “chronic pain” carries a notion of constancy, pain experiences in everyday life are not static, but rather dynamically changing within days and across days, even in patients with chronic pain9,31,52. Often the primary outcome variable in clinical settings has been the average of an individual's pain intensity over a specified period of time (e.g., the average pain over the course of one week).

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