The impact of test medium on use of visual analogue scales

Eye & Contact Lens
Craig A Woods, Brad Cumming

Abstract

Visual analog scales are frequently used as a means of allowing participants to rate symptoms during clinical trials. The accuracy and reproducibility of these scales play an important role in determining the experimental value of the data they provide. This study was initiated to compare the data collected using paper- and computer-based (Tablet PC) analog scales to better understand the variability in data provided by a visual analog scale. Thirty participants rated ocular comfort, redness, and clarity of vision (right and left eyes) on a nondemarcated horizontal line on both paper and a Tablet PC. Measurements were taken in the morning between the hours of 8:30 and 10:30 am and again the same day between 2:30 and 4:30 pm. The mean difference between the measures recorded in the morning for the 2 media was 2.6 +/- 0.9 (confidence intervals, 2 standard errors of the differences) units on a 100 unit scale, with the Tablet PC having the higher mean measure. The limits of agreement (2 standard deviations of the differences) was 9.4 units. Comparing the difference of the differences (1.0 +/- 1.3) between the 2 methods of measure (morning vs. afternoon) the visual analog scales on the Tablet PC seemed to have good reproducibility o...Continue Reading

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Citations

Sep 17, 2009·Supportive Care in Cancer : Official Journal of the Multinational Association of Supportive Care in Cancer·Rudolph M Navari, Marie C Brenner
Jun 28, 2011·Journal of Ocular Pharmacology and Therapeutics : the Official Journal of the Association for Ocular Pharmacology and Therapeutics·Elad Moisseiev, David Varssano
Nov 26, 2010·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Craig A WoodsDesmond Fonn
Jun 7, 2012·Current Eye Research·Elad MoisseievAdiel Barak
Feb 16, 2010·American Journal of Ophthalmology·Saskia M MacaTalin Barisani-Asenbauer
Apr 11, 2015·Eye·E MoisseievJ Mandelblum
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Oct 17, 2019·Clinics·Gislaine Aparecida OzórioDan Linetzky Waitzberg
Sep 24, 2019·Middle East African Journal of Ophthalmology·Burak Bilgin, Şemsettin Bilak

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