| Male n* = 35 | Female n = 13 | Probability | |
| Age of the onset (years) | 28.91 | 33.31 | 0.2171 |
| Age of consulting (years) | 36.74 | 38.15 | 0.6963 |
| Disease duration (years) | 7.83 | 4.92 | 0.1501 |
| C7-wall (cm) | 7.26 | 7.15 | 0.8996 |
| Nape-wall (cm) | 2.71 | 2.15 | 0.754 |
| Schöber index (10+ (en cm)) | 3.03 | 3.38 | 0.2898 |
| VAS** (/100mm) | 59.43 | 59.62 | 0.925 |
| BASDAI*** (/10) | 4.28 | 4.35 | 0.851 |
| BASFI**** (/10) | 3.47 | 3.55 | 0.8749 |