Spondyloarthritis & psoriatic arthritis
Understanding the drivers of Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) and back pain scores in psoriatic arthritis
Main finding · Total BASDAIResult — go to the resultβ −0.14 95% CI −0.05 to 0.33Authors' conclusion
BASDAI and its back pain subscore are influenced by peripheral musculoskeletal and skin disease activity in PsA, limiting their utility for assessing axial activity.
Study context
- Population
- Patients with BASDAI scores from a longitudinal psoriatic arthritis (PsA) cohort initiated in 1978 (mean age 44.4 years; 55.9% male)
- Participants
- 1,059 patients
- Exposure
- Axial vs peripheral-only PsA
- Axialn = 449
- Peripheraln = 610reference
- Outcome
- Association of total BASDAI and back pain subscore with axial disease
Methodological detailsunivariable and multivariable linear mixed models, stratified subgroups
- Univariable and multivariable linear mixed models
- Stratified subgroups
Main finding
Total BASDAI
β
−0.14
95% CI −0.05 to 0.33
As reported in the abstract
- Axial involvement associated with a small, yet significant increase in back pain subscore
- 0.30 (0.06-0.55)
Observational data: associations, not effects.
Further findings
Other associations of BASDAI and back pain scores
- Both associated with active peripheral joints, enthesitis, dactylitis, age, PASI, and inversely with male sex; consistent across axial and peripheral subgroups
Original publication
Understanding the drivers of BASDAI and back pain scores in psoriatic arthritis. Ann Rheum Dis. Published 30 October 2025. doi:10.
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