Interpretation of visual analog scale ratings and change scores: a reanalysis of two clinical trials of postoperative pain.

By Mark Jensen, Connie Chen, A. Brugger. Journal of Pain, 2003

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Vertebroplasty and Kyphoplasty: A Systematic Review of 69 Clinical Studies (2006, background): “[5–6], and severe pain [7–10]) than a straight reduction in pain score.(106,107) It is recommended that a reduction of 33% of the initial preoperative pain score be adopted as clinically relevant,(73,107,108) which will eliminate bias associated with pretreatment pain level and ensure consistent, re”
Measuring acute postoperative pain using the visual analog scale: the minimal clinically important difference and patient acceptable symptom state (2017, background): “27 Pooled data from two postoperative analgesic studies found that pain VAS scores of up to 44 are consistent with a patient rating of pain being mild.(42) Current guidelines recommend titrating analgesia to achieve a pain VAS score of 40 or less,(43) and postoperative pain studies using patient-con”