Clinical Journal of Pain · 2003 · 86 citations · 20 references
Relative pain reduction of 50% or more and an absolute pain reduction of at least 3 cm on the VAS are accurate in predicting a successful pain reduction after a given treatment.
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Defining the clinically important difference in pain outcome measures
John T. Farrar, Russell K. Portenoy, Jesse A. Berlin et al. · Pain · 2000 · 1.1K citations
Correlation of patient and caregiver ratings of cancer pain
Stuart A. Grossman, Vivian R. Sheidler, Karen Swedeen et al. · Journal of Pain and Symptom Management · 1991 · 434 citations · Full text