OBJECTIVE. To assess the feasibility of utility measurement in
patients with ankylosing spondylitis (AS) or fibromyalgia
(FMS). Patient derived utilities provide overall estimates of
the impact of a disease on patient well being.
Maastricht Utility Measurement Questionnaire was applied cross
sectionally to 57 patients with AS and 86 outpatients with
FMS. By means of rating scale and standard gamble techniques,
patients were asked to value their own health state.
All 143 patients completed the interview. Patients with AS
valued their personal health state on the rating scale (0-100)
considerably higher than patients with FMS (AS: 69 and FMS:
54). Standard gamble utility values (0-1), however, were about
the same at a higher level (AS: 0.86 and FMS: 0.83). Four
weeks test-retest reliability was examined in 15 patients with
FMS. The intraclass correlation coefficient of the utility
score for the patient's own health state was 0.56 for the
rating scale and 0.66 for the standard gamble technique.
CONCLUSION. Feasibility of the Maastricht Utility
Measurement Questionnaire was generally satisfactory in both
patient groups. Utility values obtained by rating scale and
standard gamble technique differed considerably. Our data
support the view that utility measurement is sensitive to the
method chosen to elicit patient well being.
Bakker C, Rutten M, van Doorslaer E, Bennett K, van der Linden S