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Figure 3. Cumulative effect of the classification rate according to the proportion of patients who fulfill (+) and those who did not fulfil (-) the original criteria in all patients with a clinical diagnosis of SpA (n=581).
SpA 581
ASAS SpA(+) 468 80.6%
ASAS SpA(-) 113 19.4%
ESSG(+) 366 (63%)
ESSG(-) 102 (17.6%)
ESSG(+) 65 (11.2%)
ESSG(-) 48 (8.3%)
Amor(+) 244 (42%)
Amor(-) 122 (21%)
Amor(+) 20 (3.4%)
Amor(-) 82 (14.1%)
Amor(+) 25 (4.3%)
Amor(-) 40 (6.9%)
Amor(+) 5 (0.9%)
Amor(-) 43 (7.4%)
DISCUSSION
This study has shown that the ASAS-criteria are most sensitive in classifying patients as having SpA, using the rheumatologist’s clinical diagnosis as an external standard. The ASAS-criteria were more sensitive than the ESSG and Amor, even if these latter were supplied with information about sacroiliitis on MRI as a SpA feature. The addition of MRI, however, did not substantially increase the classification rate of the ESSG and Amor and did not importantly influence the concordance rate with the ASAS-criteria.
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