Interpretation of visual analog scale ratings and change scores: A reanalysis of two clinical trials of postoperative pain
Interpretation of visual analog scale ratings and change scores: A reanalysis of two clinical trials of postoperative pain
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DOI：
10.1016/s1526-5900(03)00716-8
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发表时间：
2003-09-01
期刊：
影响因子：
4
通讯作者：
Brugger, AM
中科院分区：
文献类型：
--
作者：
Jensen, MP;Chen, C;Brugger, AM
视觉模拟评分（VAS）是疼痛研究中最常用的疼痛强度测量方法之一。然而，关于特定VAS评分和变化评分的解释，仍存在重要的未回答问题。为了解决这些问题，我们对2项术后疼痛随机对照试验（N = 123和N = 125）的数据进行了重新分析，以确定VAS疼痛强度评级和变化评分的意义。结果表明，100 mm VAS评分0 - 4 mm可视为无疼痛; 5 - 44 mm，轻度疼痛; 45 - 74 mm，中度疼痛; 75 - 100 mm，重度疼痛。正如预测的那样，在评估不同疼痛缓解水平对应的变化量时，患者VAS评分的百分比变化受治疗前疼痛的偏倚小于绝对变化评分。研究结果还表明，从患者的角度来看，疼痛减少33%是确定疼痛变化有意义的合理标准。(C)2003年，美国疼痛协会。
The visual analog scale (VAS) is one of the most commonly used measures of pain intensity in pain research. However, there remain important unanswered questions concerning interpretation of specific VAS ratings and change scores. To address these questions, we performed a reanalysis of data from 2 randomized controlled trials of postoperative pain (N = 123 and N = 125) to determine the meaning of VAS pain intensity ratings and change scores. The findings suggested that 100-mm VAS ratings of 0 to 4 mm can be considered no pain; 5 to 44 mm, mild pain; 45 to 74 mm, moderate pain; and 75 to 100 mm, severe pain. As predicted, in assessment of the amount of change corresponding to differing levels of pain relief, percentage change in a patient's VAS score was less biased by pretreatment pain than was absolute change score. The findings also suggested that a 33% decrease in pain represents a reasonable standard for determining that a change in pain is meaningful from the patient's perspective. (C) 2003 by the American Pain Society.