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Predictive validity of the ASAS classification criteria for axial and peripheral spondyloarthritis after follow-up in the ASAS cohort : a final analysis

(2016) ANNALS OF THE RHEUMATIC DISEASES. 75(6). p.1034-1042
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Abstract
Objective: To establish the predictive validity of the Assessment of SpondyloArthritis international Society (ASAS) spondyloarthritis (SpA) classification criteria. Methods: 22 centres (N=909 patients) from the initial 29 ASAS centres (N=975) participated in the ASAS-cohort follow-up study. Patients had either chronic (>3 months) back pain of unknown origin and age of onset below 45 years (N=658) or peripheral arthritis and/or enthesitis and/or dactylitis (N=251). At follow-up, information was obtained at a clinic visit or by telephone. The positive predictive value (PPV) of the baseline classification by the ASAS criteria was calculated using rheumatologist's diagnosis at follow-up as external standard. Results: In total, 564 patients were assessed at follow-up (345 visits; 219 telephone) with a mean follow-up of 4.4 years (range: 1.9; 6.8) and 70.2% received a SpA diagnosis by the rheumatologist. 335 patients fulfilled the axial SpA (axSpA) or peripheral SpA (pSpA) criteria at baseline and of these, 309 were diagnosed SpA after follow-up (PPV SpA criteria: 92.2%). The PPV of the axSpA and pSpA criteria was 93.3% and 89.5%, respectively. The PPV for the 'clinical arm only' was 88.0% and for the 'clinical arm'+/-'imaging arm' 96.0%, for the 'imaging arm only' 86.2% and for the 'imaging arm'+/-'clinical arm' 94.7%. A series of sensitivity analyses yielded similar results (range: 85.1-98.2%). Conclusions: The PPV of the axSpA and pSpA criteria to forecast an expert's diagnosis of 'SpA' after more than 4 years is excellent. The 'imaging arm' and 'clinical arm' of the axSpA criteria have similar predictive validity and are truly complementary.
Keywords
INTERNATIONAL SOCIETY CLASSIFICATION, SPONDYLARTHROPATHY-STUDY-GROUP, EARLY ANKYLOSING-SPONDYLITIS, CHRONIC BACK-PAIN, PERFORMANCE, MULTICENTER

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MLA
Sepriano, Alexandre, Robert Landewé, Désirée van der Heijde, et al. “Predictive Validity of the ASAS Classification Criteria for Axial and Peripheral Spondyloarthritis After Follow-up in the ASAS Cohort : a Final Analysis.” ANNALS OF THE RHEUMATIC DISEASES 75.6 (2016): 1034–1042. Print.
APA
Sepriano, A., Landewé, R., van der Heijde, D., Sieper, J., Akkoc, N., Brandt, J., Braun, J., et al. (2016). Predictive validity of the ASAS classification criteria for axial and peripheral spondyloarthritis after follow-up in the ASAS cohort : a final analysis. ANNALS OF THE RHEUMATIC DISEASES, 75(6), 1034–1042.
Chicago author-date
Sepriano, Alexandre, Robert Landewé, Désirée van der Heijde, Joachim Sieper, Nurullah Akkoc, Jan Brandt, Jürgen Braun, et al. 2016. “Predictive Validity of the ASAS Classification Criteria for Axial and Peripheral Spondyloarthritis After Follow-up in the ASAS Cohort : a Final Analysis.” Annals of the Rheumatic Diseases 75 (6): 1034–1042.
Chicago author-date (all authors)
Sepriano, Alexandre, Robert Landewé, Désirée van der Heijde, Joachim Sieper, Nurullah Akkoc, Jan Brandt, Jürgen Braun, Eduardo Collantes-Estevez, Maxime Dougados, Oliver Fitzgerald, Feng Huang, Jieruo Gu, Yesim Kirazli, Walter P Maksymowych, Helena Marzo-Ortega, Ignazio Olivieri, Salih Ozgocmen, Euthalia Roussou, Salvatore Scarpato, Inge J Sørensen, Rafael Valle-Oñate, Filip Van den Bosch, Irene van der Horst-Bruinsma, Ulrich Weber, James Wei, and Martin Rudwaleit. 2016. “Predictive Validity of the ASAS Classification Criteria for Axial and Peripheral Spondyloarthritis After Follow-up in the ASAS Cohort : a Final Analysis.” Annals of the Rheumatic Diseases 75 (6): 1034–1042.
Vancouver
1.
Sepriano A, Landewé R, van der Heijde D, Sieper J, Akkoc N, Brandt J, et al. Predictive validity of the ASAS classification criteria for axial and peripheral spondyloarthritis after follow-up in the ASAS cohort : a final analysis. ANNALS OF THE RHEUMATIC DISEASES. 2016;75(6):1034–42.
IEEE
[1]
A. Sepriano et al., “Predictive validity of the ASAS classification criteria for axial and peripheral spondyloarthritis after follow-up in the ASAS cohort : a final analysis,” ANNALS OF THE RHEUMATIC DISEASES, vol. 75, no. 6, pp. 1034–1042, 2016.
@article{8501064,
  abstract     = {Objective: To establish the predictive validity of the Assessment of SpondyloArthritis international Society (ASAS) spondyloarthritis (SpA) classification criteria. 
Methods: 22 centres (N=909 patients) from the initial 29 ASAS centres (N=975) participated in the ASAS-cohort follow-up study. Patients had either chronic (>3 months) back pain of unknown origin and age of onset below 45 years (N=658) or peripheral arthritis and/or enthesitis and/or dactylitis (N=251). At follow-up, information was obtained at a clinic visit or by telephone. The positive predictive value (PPV) of the baseline classification by the ASAS criteria was calculated using rheumatologist's diagnosis at follow-up as external standard. 
Results: In total, 564 patients were assessed at follow-up (345 visits; 219 telephone) with a mean follow-up of 4.4 years (range: 1.9; 6.8) and 70.2% received a SpA diagnosis by the rheumatologist. 335 patients fulfilled the axial SpA (axSpA) or peripheral SpA (pSpA) criteria at baseline and of these, 309 were diagnosed SpA after follow-up (PPV SpA criteria: 92.2%). The PPV of the axSpA and pSpA criteria was 93.3% and 89.5%, respectively. The PPV for the 'clinical arm only' was 88.0% and for the 'clinical arm'+/-'imaging arm' 96.0%, for the 'imaging arm only' 86.2% and for the 'imaging arm'+/-'clinical arm' 94.7%. A series of sensitivity analyses yielded similar results (range: 85.1-98.2%). 
Conclusions: The PPV of the axSpA and pSpA criteria to forecast an expert's diagnosis of 'SpA' after more than 4 years is excellent. The 'imaging arm' and 'clinical arm' of the axSpA criteria have similar predictive validity and are truly complementary.},
  author       = {Sepriano, Alexandre and Landewé, Robert and van der Heijde, Désirée and Sieper, Joachim and Akkoc, Nurullah and Brandt, Jan and Braun, Jürgen and Collantes-Estevez, Eduardo and Dougados, Maxime and Fitzgerald, Oliver and Huang, Feng and Gu, Jieruo and Kirazli, Yesim and Maksymowych, Walter P and Marzo-Ortega, Helena and Olivieri, Ignazio and Ozgocmen, Salih and Roussou, Euthalia and Scarpato, Salvatore and Sørensen, Inge J and Valle-Oñate, Rafael and Van den Bosch, Filip and van der Horst-Bruinsma, Irene and Weber, Ulrich and Wei, James and Rudwaleit, Martin},
  issn         = {0003-4967},
  journal      = {ANNALS OF THE RHEUMATIC DISEASES},
  keywords     = {INTERNATIONAL SOCIETY CLASSIFICATION,SPONDYLARTHROPATHY-STUDY-GROUP,EARLY ANKYLOSING-SPONDYLITIS,CHRONIC BACK-PAIN,PERFORMANCE,MULTICENTER},
  number       = {6},
  pages        = {1034--1042},
  title        = {Predictive validity of the ASAS classification criteria for axial and peripheral spondyloarthritis after follow-up in the ASAS cohort : a final analysis},
  url          = {http://dx.doi.org/10.1136/annrheumdis-2015-208730},
  volume       = {75},
  year         = {2016},
}

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