Proportion of patients categorized with impaired spinal mobility according to subgroups. Values are n (%).
| Variables | N | All Patients, n = 393 | AxSpA, n = 142 | Possible SpA, n = 140 | No SpA, n = 111 | p |
|---|---|---|---|---|---|---|
| Measure | ||||||
| Lateral spinal flexion | 393 | 158 (40) | 50 (35) | 57 (41) | 51 (46) | 0.22 |
| Chest expansionγ | 373 | 81 (22) | 27 (20) | 31 (24) | 23 (21) | 0.81 |
| Cervical rotation | 389 | 69 (18) | 21 (15) | 31 (23) | 17 (15) | 0.18 |
| Intermalleolar distanceγ | 370 | 63 (17) | 16 (12) | 28 (21) | 19 (18) | 0.13 |
| Lumbar flexion, 10 cm Schober’s | 393 | 57 (15) | 17 (12) | 20 (14) | 20 (18) | 0.40 |
| Occiput-to-wall distance | 393 | 42 (11) | 18 (13) | 18 (13) | 6 (5) | 0.10 |
| BASMI | 386 | 111 (29) | 29 (21) | 45 (33) | 37 (33) | 0.03 α, β |
| Impaired mobility measures δ | ||||||
| N | 367 | 131 | 128 | 108 | ||
| No. impaired mobility measures | ||||||
| 1 | 118 (32) | 38 (29) | 40 (31) | 40 (37) | ||
| 2 | 68 (19) | 18 (14) | 23 (18) | 27 (25) | ||
| 3 | 37 (10) | 15 (11) | 15 (12) | 7 (6) | ||
| ≥ 4 | 19 (5) | 5 (4) | 9 (7) | 5 (5) | ||
| No. with at least 1 impaired mobility measure | 242 (66) | 76 (58) | 87 (68) | 79 (73) |
↵Statistically significant subgroup difference between α axSpA and possible SpA, β axSpA and no SpA. γ Derivation of reference percentile included height. δ Patients with complete set of mobility measures. AxSpA: axial spondyloarthritis; BASMI: Bath Ankylosing Spondylitis Metrology Index.