Characteristics of the spinal measurements in normal individuals (aged 20–69 years, men and women)
| Measure | Mean (SD) | 95% CI | Minimum–maximum | Median | IQR |
|---|---|---|---|---|---|
| Tragus-to-wall, cm | 11.2 (1.2) | 11.1 to 11.3 | 8.9–19.5 | 11.0 | 1.1 |
| Occiput-to-wall, cm | 0.2 (1.0) | 0.1 to 0.3 | 0.0–8.0 | 0.0 | 0.0 |
| ASAS lateral spinal flexion, cm | 19.2 (3.7) | 18.9 to 19.6 | 8.0–29.8 | 19.3 | 4.9 |
| INSPIRE lateral spinal flexion, cm | 33.6 (6.0) | 33.0 to 34.2 | 12.0–49.2 | 34.0 | 7.5 |
| Chest expansion, cm | 6.9 (2.2) | 6.7 to 7.1 | 1.0–13.0 | 6.9 | 3.5 |
| Cervical rotation (sitting), degrees | 74 (11) | 72 to 75 | 38–102 | 74 | 14 |
| Cervical rotation (lying), degrees | 75 (9) | 74 to 76 | 36–97 | 76 | 12 |
| Intermalleolar distance, cm | 112 (14) | 110 to 113 | 61–154 | 111 | 18 |
| Internal hip rotation, cm | 48 (10) | 47 to 49 | 20–75 | 48 | 12 |
| 10 cm Schober test, cm | 5.0 (1.0) | 4.9 to 5.1 | 2.2–8.1 | 5.0 | 1.2 |
| 15 cm Schober test, cm | 6.3 (1.2) | 6.2 to 6.4 | 2.2–10.5 | 6.2 | 1.5 |
| BASMI-original, 0–10* | 1.47 (0.73) | 1.39 to 1.55 | 0.28–4.29 | 1.33 | 0.96 |
| BASMI-modified, 0–10† | 1.83 (0.74) | 1.75 to 1.91 | 0.18–4.67 | 1.72 | 0.97 |
N=393; for cervical rotation sitting position N=323.
*BASMI-original: calculated with cervical rotation in lying position and 15 cm Schober test.
†BASMI-modified: calculated with cervical rotation in sitting position and 10 cm Schober test.
ASAS, Assessment in Spondyloarthritis international Society; BASMI, Bath Ankylosing Spondylitis Metrology Index.