期刊
CLINICAL JOURNAL OF PAIN
卷 16, 期 1, 页码 22-28出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00002508-200003000-00005
关键词
four-category verbal rating scale; 11-point numeric rating scale; postoperative pain; stochastic simulation; power; visual analog scale
Objective: The goals of this study were to examine agreement and estimate differences in sensitivity between pain assessment scales. Design: Multiple simultaneous pain assessments by patients in acute pain after oral surgery were used to compare a four-category verbal rating scale (VRS-4) and an 11-point numeric rating scale (NRS-11) with a 100-mm visual analog scale (VAS). The sensitivity of the scales (i.e., their ability [power] to detect differences between treatments) was compared in a simulation model by sampling from true pairs of observations using varying treatment differences of predetermined size. Results: There was considerable variability in VAS scores within each VRS-4 or NRS-11 category both between patients and for repeated measures from the same patient. Simulation experiments showed that the VAS was systematically more powerful than the VRS-4 in all simulations performed. The sensitivity of the VAS and NRS-11 was approximately equal. Conclusions: In this acute pain model, the VRS-4 was less sensitive than the VAS. The simulation results demonstrated similar sensitivity of the NRS-11 and VAS when comparing acute postoperative pain intensity. The choice between the VAS and NRS-11 can thus be based on subjective preferences.
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