Table 1 Characteristics of the study participants and frequency of MRI lesions recorded by ≥2 readers.
Variable | AS ≤ 5 years duration (n= 15) | AS > 5/≤10 years duration (n= 15) | NSBP (n= 15) | HC (n= 15) |
|---|---|---|---|---|
Male:female | 8:7 | 9:6 | 10:5 | 8:7 |
Age, years | 26.4 (2.8) | 31.0 (9.5) | 35.0 (8.5) | 28.7 (4.8) |
Symptom duration, years | 3.0 (2.0) | 8.0 (2.0) | N/A | N/A |
HLA-B27 positive, % | 86.7 | 80.0 | N/A | N/A |
BASDAI, NRS | 4.2 (2.2) | 3.9 (2.8) | N/A | N/A |
BASFI, NRS | 2.9 (4.2) | 1.8 (2.0) | N/A | N/A |
CRP level, mg/l | 8.5 (12.3) | 3.8 (2.5) | N/A | N/A |
ER (%) | 15 (100) | 15 (100) | 5 (33.3) | 1 (6.7) |
BME (%) | 15 (100) | 12 (80.0) | 3 (20.0) | 3 (20.0) |
FI (%) | 14 (93.3) | 12 (80.0) | 4 (26.7) | 4 (26.7) |
EE (%) | 13 (86.7) | 10 (66.7) | 0 (0) | 0 (0) |
BF (%) | 8 (53.3) | 11 (73.3) | 0 (0) | 1 (6.7) |