OBJECTIVE: To examine the psychometric properties and construct validity of a self-administered Rheumatoid Arthritis Disease Activity Index (RADAI). METHODS: Five items of the Rapid Assessment of Disease Activity in Rheumatology (RADAR) questionnaire were aggregated into the RADAI and assessed for their factor loading, internal consistency, and construct validity. RESULTS: In 55 patients with RA, the RADAI had a high internal consistency (Cronbach's alpha = 0.91) and correlated with physician's assessment of disease activity (r = 0.54, P < 0.01), the swollen joint count (r = 0.54, P < 0.01), and the C-reactive protein value (r = 0.43, P < 0.01). CONCLUSION: The RADAI is a highly reliable and valid self-administered measure of disease activity for clinical, health services, and epidemiologic research. Its sensitivity to change in longitudinal studies needs further study.
OBJECTIVE: To examine the psychometric properties and construct validity of a self-administered Rheumatoid Arthritis Disease Activity Index (RADAI). METHODS: Five items of the Rapid Assessment of Disease Activity in Rheumatology (RADAR) questionnaire were aggregated into the RADAI and assessed for their factor loading, internal consistency, and construct validity. RESULTS: In 55 patients with RA, the RADAI had a high internal consistency (Cronbach's alpha = 0.91) and correlated with physician's assessment of disease activity (r = 0.54, P < 0.01), the swollen joint count (r = 0.54, P < 0.01), and the C-reactive protein value (r = 0.43, P < 0.01). CONCLUSION: The RADAI is a highly reliable and valid self-administered measure of disease activity for clinical, health services, and epidemiologic research. Its sensitivity to change in longitudinal studies needs further study.
Authors: Nasim Ahmed Khan; Horace Jack Spencer; Essam Ahmed Abda; Rieke Alten; Christof Pohl; Codrina Ancuta; Massimiliano Cazzato; Pál Géher; Laure Gossec; Dan Henrohn; Merete Lund Hetland; Nevsun Inanc; Johannes Wg Jacobs; Eduardo Kerzberg; Maria Majdan; Omondi Oyoo; Ruben A Peredo-Wende; Zahraa Ibrahim Selim; Fotini Nikolaos Skopouli; Alberto Sulli; Kim Hørslev-Petersen; Peter C Taylor; Tuulikki Sokka Journal: Ann Rheum Dis Date: 2012-04-24 Impact factor: 19.103
Authors: Peter M ten Klooster; Martine M Veehof; Erik Taal; Piet L C M van Riel; Mart A F J van de Laar Journal: Ann Rheum Dis Date: 2007-05-01 Impact factor: 19.103