Table 1 Baseline characteristics for all patients with axial symptoms included in Esperanza (left column) and for the subgroup of patients who underwent MRI-SI (right column)
Characteristic | Patients with axial symptoms referred to Esperanza (n = 665) | Patients with axial symptoms and SIJ MRI available (n = 326) |
|---|---|---|
Age, years | 33.2 ± 7.1 | 32.8 ± 7.0 |
Male | 363 (54.6) | 175 (53.7) |
Symptoms duration, months | 11.9 ± 6.6 | 12.6 ± 6.4 |
Morning stiffness | 393 (59.1) | 195 (59.8) |
Improve with exercise, not with rest | 208 (31.3) | 97 (29.8) |
Alternating buttock pain | 197 (29.6) | 98 (30.1) |
Insidious onset | 430 (64.7) | 256 (78.5) |
Awakening at second half of night | 315 (47.4) | 169 (51.8) |
Response to NSAIDs | 407 (61.2) | 200 (61.3) |
Enthesitis | 107 (16.1) | 45 (13.8) |
Psoriasis | 82 (12.3) | 35 (10.7) |
Dactylitis | 26 (3.9) | 14 (4.3) |
IBD | 26 (3.9) | 10 (3.1) |
Uveitis | 34 (5.1) | 16 (4.9) |
Arthritis | 95 (14.3) | 37 (11.3) |
Family history | 170 (25.6) | 89 (27.3) |
HLA-B27 | 270 (40.6) | 144 (44.2) |
Elevated CRP, mg/L | 177 (26.6) | 89 (27.3) |
BASDAI | 4.0 ± 2.3 | 3.9 ± 2.3 |
BASFI | 2.5 ± 2.4 | 2.3 ± 2.4 |
ASAS criteria for axial SpA | 291 (43.8) | 167 (51.2) |
Imaging arm | 194 (29.2) | 132 (40.5) |
MRI-SI positive | 85 (12.8) | 85 (26.1) |
mNY-positivea | 109 (16.4) | 47 (14.4) |
Clinical arm only | 97 (14.6) | 35 (10.7) |