Journal article
A comparison of seven-point and visual analogue scales Data from a randomized trial
Abstract
Many controlled trials rely on subjective measures of symptoms or quality of life as primary outcomes. The relative merits of different response options for these instruments is an important issue. Therefore, we compared the responsiveness and validity of seven-point versus visual analogue scales (VAS) in a questionnaire measuring quality of life in chronic heart failure in a double-masked crossover trial of digoxin versus placebo. The VAS and …
Authors
Jaeschke R; Singer J; Guyatt GH
Journal
Contemporary Clinical Trials, Vol. 11, No. 1, pp. 43–51
Publisher
Elsevier
Publication Date
February 1990
DOI
10.1016/0197-2456(90)90031-v
ISSN
1551-7144