Skip to main content

01.10.2008 | Ausgabe 8/2008

Quality of Life Research 8/2008

Testing the measurement equivalence of paper and touch-screen versions of the EQ-5D visual analog scale (EQ VAS)

Quality of Life Research > Ausgabe 8/2008
Sulabha Ramachandran, J. Jason Lundy, Stephen Joel Coons
Wichtige Hinweise
Sulabha Ramachandran is an employee of AstraZeneca. However, the views and opinions expressed in this article are solely those of the authors and do not necessarily state or reflect those of AstraZeneca.



This study examined the measurement equivalence of the original paper-based vertical format of the EQ-5D visual analog scale (EQ VAS) with a touch-screen computer-based horizontal format.


A total of 314 subjects were administered two modes of the EQ VAS in a randomized crossover design. One mode was the original paper-based 20 cm vertical EQ VAS; the other mode was touch-screen-based. Measurement equivalence was assessed by testing the 95% confidence interval of the mean differences from an equivalence threshold of −3 to +3 points on the VAS and evaluating the intraclass correlation coefficient (ICC).


The adjusted mean (SE) EQ VAS score was 80.96 (0.87) on the paper and 79.59 (0.85) on the touch-screen. The mean (CI) difference between scores on the two formats was 1.37 with a confidence interval of 0.175–2.559, wholly contained within the equivalence interval. The ICC was 0.75, indicating acceptable agreement between the two modes. Almost a third (30.1%) of the respondents reported identical scores on both formats.


These results provide evidence for the measurement equivalence of this EQ VAS touch-screen administration mode with the original paper mode.

Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten

e.Med Interdisziplinär

Mit e.Med Interdisziplinär erhalten Sie Zugang zu allen CME-Fortbildungen und Fachzeitschriften auf Zusätzlich können Sie eine Zeitschrift Ihrer Wahl in gedruckter Form beziehen – ohne Aufpreis.

Über diesen Artikel

Weitere Artikel der Ausgabe 8/2008

Quality of Life Research 8/2008 Zur Ausgabe