Patient characteristics of the OASIS cohort at baseline (n = 199)
| Variable | Mean | SD | Median | 25th Centile | 75th Centile | Min | Max |
|---|---|---|---|---|---|---|---|
| OASIS, Outcome in Ankylosing Spondylitis International Study; mSASSS, modified Stoke Ankylosing Spondylitis Spinal Score; BASMI, Bath Ankylosing Spondylitis Metrology Index; SD, standard deviation. | |||||||
| Age (years) | 43.7 | 12.7 | 43.1 | 33.4 | 52.9 | 19.0 | 78.0 |
| Duration of complaints (years) | 20.1 | 11.7 | 17.1 | 11.7 | 27.1 | 0.0 | 52.5 |
| Duration of disease after diagnosis (years) | 11.4 | 9.0 | 9.5 | 4.3 | 15.2 | 0.2 | 42.0 |
| Male (%) | 71 | ||||||
| Radiographic changes, mSASSS (units) | 14.0 | 19.5 | 5.0 | 0.0 | 18.0 | 0.0 | 72.0 |
| Spinal mobility measures | |||||||
| Chest expansion (cm) | 4.7 | 2.2 | 4.5 | 3.2 | 6.0 | 0.4 | 12.5 |
| Finger to floor distance (cm) | 14.2 | 13.5 | 12.2 | 1.0 | 22.9 | 0.0 | 56.5 |
| Occiput to wall distance (cm) | 3.8 | 5.4 | 1.0 | 0.0 | 6.0 | 0.0 | 26.0 |
| Tragus to wall distance (cm) | 14.1 | 4.4 | 12.5 | 11.1 | 15.8 | 8.0 | 32.5 |
| Modified Schober (cm) | 2.9 | 4.4 | 3.0 | 1.8 | 4.0 | 0.0 | 6.8 |
| Lateral spinal flexion (cm) | 11.2 | 5.7 | 10.9 | 6.4 | 15.3 | 1.2 | 26.1 |
| Cervical rotation (degrees) | 64.2 | 23.1 | 68.0 | 51.0 | 81.0 | 6.0 | 107.0 |
| Intermalleolar distance (cm) | 105.0 | 21.7 | 105.1 | 94.0 | 119.0 | 38.0 | 152.0 |
| BASMI | 3.6 | 1.6 | 3.5 | 2.4 | 4.4 | 1.0 | 8.0 |