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Work outcome in yet undiagnosed patients with non-radiographic axial spondyloarthritis and ankylosing spondylitis; results of a cross-sectional study among patients with chronic low back pain

Authors
  • van Hoeven, Lonneke1, 2
  • Boonen, Annelies E. R. C. H.3
  • Hazes, Johanna M. W.1
  • Weel, Angelique E. A. M.1, 2
  • 1 Erasmus MC, Department of Rheumatology, Wytemaweg 80, Rotterdam, 3015 CN, The Netherlands , Rotterdam (Netherlands)
  • 2 Maasstad Hospital, Department of Rheumatology, Maasstadweg 21, Rotterdam, 3079 DZ, The Netherlands , Rotterdam (Netherlands)
  • 3 Maastricht University Medical Centre, Department of Rheumatology, P. Debyelaan 25, Maastricht, 6229 HX, The Netherlands , Maastricht (Netherlands)
Type
Published Article
Journal
Arthritis Research & Therapy
Publisher
Springer Science and Business Media LLC
Publication Date
Jun 17, 2017
Volume
19
Issue
1
Identifiers
DOI: 10.1186/s13075-017-1333-x
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundTo understand the impact of yet undiagnosed non-radiographic axial spondyloarthritis (nr-axSpA) and ankylosing spondylitis (AS) on work outcomes in a cohort of patients with long-lasting chronic low back pain (CLBP).MethodsData were used from a primary care CLBP cohort that was established to understand the prevalence of nr-axSpA and AS. Clinical characteristics comprised measures of back pain (visual analogue scale), inflammation (C-reactive protein) and physical functioning (Roland Morris Disability Questionnaire (RMDQ)). Worker outcomes comprised a question on employment and the Work Productivity and Activity Impairment (WPAI) questionnaire, distinguishing absenteeism, presenteeism, and overall work impairment in those employed and activity impairment in all patients. For each disease subgroup, employment ratio compared to the general population was assessed by indirect standardization. Factors associated with work productivity were explored by zero inflated negative binomial (ZINB) regression models.ResultsPatients with CLBP (n = 579) were included (41% male, mean age 36 years), of whom 71 (12%) were identified as having nr-axSpA and 24 (4%) as having AS. The standardized employment ratios were 0.89 (95% CI 0.84–0.94), 0.97 (95% CI 0.85–1.09) and 0.81 (95% CI 0.56–1.06) for patients with CLBP, nr-axSpA and AS, respectively. Scores for the WPAI subdomains were not significantly different between patients with CLBP, nr-axSpA or AS. The ZINB models showed significant associations between visual analog scale (VAS) score for pain and RMDQ and work productivity.ConclusionThe impact of yet undiagnosed nr-axSpA and AS on patients’ work outcomes was substantial but was not significantly different from those of patients with long-standing CLBP. Variables significantly associated with reduced work productivity were VAS for pain and RMDQ score.

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