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The change in pain severity was compared using Chi-square test. Following explanation, a change in severity was seen for PS at rest [ (9, N- 36 = 441, 0.001] and at movement [X (9, N- 36 = 508, 0.001]. Overall, a change in PS severity was seen in 162 patients (45%). A decrease and an increase in the severity of pain was seen in 119 and 41 patients respectively. Explaining the clinical interpretation of PS on a NRS does lead to a change in patients' self-assessed PS. Explaining the clinical interpretati