The pain visual analog scale: is it linear or nonlinear?

Abstract:

UNLABELLED:The visual analog scale (VAS) is a tool widely used to measure pain, yet controversy surrounds whether the VAS score is ratio or ordinal data. We studied 52 postoperative patients and measured their pain intensity using the VAS. We then asked them to consider different amounts of pain (conceptually twice as much and then half as much) and asked them to repeat their VAS rating after each consideration (VAS2 and VAS3, respectively). Patients with unrelieved pain had their pain treated with IV fentanyl and were then asked to rate their pain intensity when they considered they had half as much pain. We compared the baseline VAS (VAS1) with VAS2 and VAS3. The mean (95% confidence interval) for VAS2:1 was 2.12 (1.81-2.43) and VAS3:1 was 0.45 (0.38-0.52). We conclude that the VAS is linear for mild-to-moderate pain, and the VAS score can be treated as ratio data. IMPLICATIONS:A change in the visual analog scale score represents a relative change in the magnitude of pain sensation. Use of the VAS in comparative analgesic trials can now meaningfully quantify differences in potency and efficacy.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

Myles PS,Troedel S,Boquest M,Reeves M

doi

10.1097/00000539-199912000-00038

subject

Has Abstract

pub_date

1999-12-01 00:00:00

pages

1517-20

issue

6

eissn

0003-2999

issn

1526-7598

journal_volume

89

pub_type

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