| Age, y | 32.1 (7.4) | 30.9 (6.8) | 32.5 (7.8) | 35.3 (7.3) | 29.3 (7.9) | 33.5 (6.2) | 47.0 (2.8) | 0.2132 |
| Male, n (%) | 92 (65.3) | 46 (73.0) | 27 (51.9) | 4 (57.1) | 4 (100) | 9 (69.2) | 2 (100) | 0.0896 |
| Symptom duration, y | 2.6 (1.9) | 2.4 (2.2) | 2.6 (1.5) | 2.7 (1.6) | 1.8 (1.5) | 3.2 (1.6) | 2.9 (1.6) | 0.2944 |
| SPARCC MRI SIJ score | 10.5 (9.9) | 15.9 (10.4) | 5.4 (5.1) | 2.1 (0.2) | 27.5 (10.2) | 5.9 (4.1) | 2.5 (0.7) | 0.0007 |
| Left SPARCC SIJ | 5.2 (6.0) | 7.9 (6.1) | 3.1 (5.3) | 0.8 (0.3) | 10.4 (7.4) | 1.8 (2.1) | 1.3 (0.4) | 0.0004 |
| Right SPARCC SIJ | 5.4 (6.2) | 8.0 (7.0) | 2.3 (2.5) | 1.4 (0.2) | 17.1 (6.3) | 4.0 (5.0) | 1.3 (0.4) | 0.0542 |
| SPARCC MRI 6 DVU spinal score | 4.7 (6.8) | 6.4 (8.5) | 3.8 (5.5) | 2.4 (2.1) | 1.6 (3.3) | 2.6 (3.4) | 0.8 (1.1) | 0.0133 |
| SPARCC MRI 23 DVU spinal score | 5.3 (9.3) | 7.5 (12.2) | 4.0 (6.0) | 2.4 (2.1) | 1.6 (3.3) | 3.4 (5.3) | 0.8 (1.1) | 0.0335 |
| Fat metaplasia | 0.5 (1.6) | 0.3 (0.9) | 0.9 (2.5) | 0 (0) | 0.3 (0.5) | 0.7 (1.1) | 0 (0) | 0.6805 |
| Erosions | 2.6 (3.5) | 4.2 (4.0) | 1.1 (2.0) | 0.3 (0.4) | 3.1 (1.8) | 1.0 (1.9) | 0 (0) | 0.0002 |