A comparison of the ICECAP-O with EQ-5D in a falls prevention clinical setting: are they complements or substitutes?
OBJECTIVE
Our research explored whether two preference-based outcome measures (EuroQol EQ-5D and ICECAP-O) are complements or substitutes in the context of the Vancouver Falls Prevention Clinic for seniors.


METHODS
The EQ-5D and ICECAP-O were administered once at 12 months post first clinic attendance. We report descriptive statistics for all baseline characteristics collected at first clinic visit and primary outcomes of interest. We ascertain feasibility by reporting item completion rates for the EQ-5D and ICECAP-O. Contingency tables for a priori assertions between the ICECAP-O and EQ-5D were used to demonstrate whether unique or similar aspects of benefit were captured. We used exploratory factor analysis, to ascertain the number of unique underlying latent factors associated with the attributes assessed by the EQ-5D and ICECAP-O.


RESULTS
We report data on 215 seniors who attended the Vancouver Falls Prevention Clinic who had a mean age of 79.3 (6.2) years. The item completion rate was 99 % for the EQ-5D and 92 % for the ICECAP-O. The two contingency tables detailed few discrepancies. The results of the exploratory factor analysis indicate that the two instruments are tapping into distinct factors that are complementary.


CONCLUSIONS
Our study suggests that the EQ-5D and ICECAP-O provide complementary information.
Centre for Clinical Epidemiology and Evaluation, Vancouver Coastal Health Research Institute, The University of British Columbia, 828 West 10th Avenue, Vancouver, BC, V5Z 1M9, Canada. jennifer.davis@ubc.ca
Jennifer C
JC
Davis
Teresa
T
Liu-Ambrose
Chris G
CG
Richardson
Stirling
S
Bryan
D000058:Accidental Falls / Q000517:prevention & control*; D000203:Activities of Daily Living / Q000523:psychology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D015577:Geriatric Assessment / Q000379:methods* / Q000706:statistics & numerical data; D006304:Health Status; D006801:Humans; D008297:Male; D017063:Outcome Assessment, Health Care; D057240:Patient Preference; D011788:Quality of Life; D015203:Reproducibility of Results; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires