Is ASDAS better than BASDAI as a measure of disease activity in axial psoriatic arthritis?

Centre for Prognosis Studies in the Rheumatic Diseases, University of Toronto Psoriatic Arthritis Clinic, Toronto Western Hospital, Toronto, Ontario, Canada.
Annals of the rheumatic diseases (Impact Factor: 10.38). 12/2010; 69(12):2160-4. DOI: 10.1136/ard.2010.129726
Source: PubMed


To assess the discriminative ability and correlation of the Ankylosing Spondylitis Disease Activity Score (ASDAS) and Bath Ankylosing Spondylitis Activity Disease Activity Index (BASDAI) with disease activity in axial psoriatic arthritis (AxPsA).
Patients with AxPsA were selected from a large prospective cohort study of psoriatic arthritis. Patient and physician global scores were used as constructs of disease activity. Patients were categorised into high and low disease activity states based on patient and physician global assessment scores and physician's decision to change treatment. Statistical analysis included descriptive statistics, linear and logistic regression.
201 patients with AxPsA were included in the study. ASDAS and BASDAI showed good correlation with disease activity as reflected by the patient global score (correlation coefficients (r) for BASDAI 0.84, ASDAS-B 0.77, ASDAS-C 0.81, p < 0.001) and the physician global score (r = 0.53 for BASDAI, r = 0.50 for ASDAS-B, r = 0.55 for ASDAS-C, p < 0.001). Both scores showed good discriminative ability between high and low disease activity states. However, there were no significant differences between areas under the curve for the models that compared ASDAS with BASDAI for each definition of disease activity state.
In patients with AxPsA, ASDAS and BASDAI scores show similar good to moderate discriminative ability and correlation with different constructs of disease activity. ASDAS was not superior to BASDAI in its ability to discriminate between high and low disease activity states in AxPsA.

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Available from: Lihi Eder, Mar 23, 2014
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    • "Clinical and ultrasonographic (US) evaluation of the lateral surface of the head of the 5th metatarsal bone were performed in all PsA patients and controls focusing on the detection of inconstant bursitis on this site. Disease activity was assessed in all SpA and PsA patients in accordance with the currently available indices, that is, ASDAS (Ankylosing Spondylitis Disease Activity Score) for AS and uSpA [7] [8]; DAREA (Disease Activity Index for Reactive Arthritis) for ReA [9]; DAPSA (Disease Activity Index for Psoriatic Arthritis) and ASDAS for PsA [10] [11]. The last two scores (DAPSA and ASDAS) were also used for the assessment of IBD-SpA disease activity. "
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