TY - JOUR
T1 - Comparison of measures of functional disability in patients with gout
AU - ten Klooster, Peter M.
AU - Oude Voshaar, Antonius H.
AU - Taal, Erik
AU - van de Laar, Mart A F J
PY - 2011
Y1 - 2011
N2 - Objective. To compare the measurement properties of the HAQ disability index (HAQ-DI), HAQ-II and short form 36 physical functioning scale (PF-10) in patients with gout.
Methods. A cross-sectional sample of 97 patients with gout completed all three measures. Reliability was assessed by examining the internal consistency of the scales. Validity was assessed by testing for expected intercorrelations and associations with other aspects of health status and the ability to discriminate between patients with different levels of general health. Additionally, distributional properties were examined.
Results. All three measures demonstrated high reliability (Cronbach’s α ≥0.93), strong intercorrelations (r ≥ 0.75), and the expected pattern of external correlations. The HAQ-DI and HAQ-II performed somewhat better in discriminating between patients. However, both demonstrated ceiling effects of 34.0 and 25.8%, respectively, compared with only 7.2% of the patients scoring no disability on the PF-10.
Conclusions. The HAQ-DI, HAQ-II and PF-10 demonstrated similar and adequate reliability and validity for measuring functional disability in patients with gout. The large ceiling effects of both HAQ versions, however, may point to limited content validity and responsiveness to change. Further research should examine whether current instruments cover all aspects of physical functioning relevant to patients with gout
AB - Objective. To compare the measurement properties of the HAQ disability index (HAQ-DI), HAQ-II and short form 36 physical functioning scale (PF-10) in patients with gout.
Methods. A cross-sectional sample of 97 patients with gout completed all three measures. Reliability was assessed by examining the internal consistency of the scales. Validity was assessed by testing for expected intercorrelations and associations with other aspects of health status and the ability to discriminate between patients with different levels of general health. Additionally, distributional properties were examined.
Results. All three measures demonstrated high reliability (Cronbach’s α ≥0.93), strong intercorrelations (r ≥ 0.75), and the expected pattern of external correlations. The HAQ-DI and HAQ-II performed somewhat better in discriminating between patients. However, both demonstrated ceiling effects of 34.0 and 25.8%, respectively, compared with only 7.2% of the patients scoring no disability on the PF-10.
Conclusions. The HAQ-DI, HAQ-II and PF-10 demonstrated similar and adequate reliability and validity for measuring functional disability in patients with gout. The large ceiling effects of both HAQ versions, however, may point to limited content validity and responsiveness to change. Further research should examine whether current instruments cover all aspects of physical functioning relevant to patients with gout
KW - IR-82739
KW - METIS-281135
U2 - 10.1093/rheumatology/keq387
DO - 10.1093/rheumatology/keq387
M3 - Article
VL - 50
SP - 709
EP - 713
JO - Rheumatology
JF - Rheumatology
SN - 1462-0324
IS - 4
ER -