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Research ArticleArticle

Ankylosing Spondylitis and Nonradiographic Axial Spondyloarthritis: Part of a Common Spectrum or Distinct Diseases?

Dinny Wallis, Nigil Haroon, Renise Ayearst, Adele Carty and Robert D. Inman
The Journal of Rheumatology December 2013, 40 (12) 2038-2041; DOI: https://doi.org/10.3899/jrheum.130588
Dinny Wallis
From the Division of Rheumatology, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada.
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Nigil Haroon
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Renise Ayearst
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Adele Carty
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Robert D. Inman
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  • For correspondence: Robert.inman@uhn.ca
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    Figure 1.

    The concept of nonradiographic axial spondyloarthritis (nr-axSpA): 3 theories. AS: ankylosing spondylitis.

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    Table 1.

    Disease characteristics of the axial spondyloarthritis (SpA) population.

    Variables*AS, n = 639nr-axSpA, n = 73p
    Male %76.247.9< 0.0001†
    HLA-B27 positive, %78.972.50.21
    Age at last visit, yrs41.4 (13.6)37.7 (12.7)0.05
    Age at time of diagnosis, yrs30.5 (11.7)32.2 (12.0)0.11
    Age at symptom onset, yrs23.9 (9.8)26.4 (10.6)0.03
    Time from symptom onset to diagnosis, yrs6.7 (7.9)5.5 (6.3)0.28
    Disease duration at last clinic visit, yrs17.7 (12.3)12.1 (8.5)0.0002†
    Currently unemployed due to disability from AS, %15.66.90.05
    Current NSAID use, %68.872.20.59
    Current DMARD use, %18.418.81.00
    Current glucocorticoid use, %5.64.10.79
    Ever biologic use, %44.442.50.80
    Current biologic use, %43.634.30.16
    CRP, mg/l11.4 (14.9)5.2 (5.3)< 0.0001†
    ESR, mm/h13.7 (14.2)9.9 (11.9)0.02†
    Total back pain, VAS, 0–104.4 (2.5)4.7 (2.8)0.46
    BASDAI4.4 (2.3)4.7 (2.2)0.35
    BASMI2.8 (2.5)1.4 (1.2)< 0.0001†
    BASFI3.6 (2.6)3.0 (2.4)0.05
    BAS-G4.8 (2.4)5.2 (2.5)0.29
    HAQ-DI0.65 (0.58)0.57 (0.48)0.27
    SF-36 mental component46.4 (10.7)45.7 (10.7)0.63
    SF-36 physical component38.2 (10.2)37.9 (10.8)0.80
    Fatigue severity scale5.1 (2.6)5.2 (2.6)0.68
    ASQoL7.4 (5.5)7.1 (5.2)0.60
    EQ-5D0.70 (0.21)0.67 (0.19)0.41
    History of fibromyalgia, %6.113.70.02†
    History of uveitis, %29.227.40.79
    History of psoriasis, %9.49.60.98
    History of IBD, %12.511.00.85
    Ever smoker, %43.041.10.81
    Current smoker, %23.218.30.37
    • ↵* Values are mean (SD) unless stated otherwise.

    • ↵† Statistically significant. NSAID: nonsteroidal antiinflammatory drug; DMARD: disease-modifying antirheumatic drug; VAS: visual analog scale; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; BASMI: Bath Ankylosing Spondylitis Metrology Index; BASFI: Bath Ankylosing Spondylitis Functional Index; BAS-G: Bath Ankylosing Spondylitis patient Global score; ASQoL: Ankylosing Spondylitis Quality of Life score; EQ-5D: European Quality of Life 5 Dimensions questionnaire; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; HAQ-DI: Health Assessment Questionnaire–Disability Index; SF-36: Medical Outcomes Study Short Form-36 questionnaire; IBD: inflammatory bowel disease.

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The Journal of Rheumatology
Vol. 40, Issue 12
1 Dec 2013
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Ankylosing Spondylitis and Nonradiographic Axial Spondyloarthritis: Part of a Common Spectrum or Distinct Diseases?
Dinny Wallis, Nigil Haroon, Renise Ayearst, Adele Carty, Robert D. Inman
The Journal of Rheumatology Dec 2013, 40 (12) 2038-2041; DOI: 10.3899/jrheum.130588

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Ankylosing Spondylitis and Nonradiographic Axial Spondyloarthritis: Part of a Common Spectrum or Distinct Diseases?
Dinny Wallis, Nigil Haroon, Renise Ayearst, Adele Carty, Robert D. Inman
The Journal of Rheumatology Dec 2013, 40 (12) 2038-2041; DOI: 10.3899/jrheum.130588
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Keywords

ANKYLOSING SPONDYLITIS
AXIAL SPONDYLOARTHRITIS

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