TABLE 2.
Study population characterization. Cases group (n = 27) and Healthy control group (n = 24).
| Characteristics | Cases, n (%) | Mean ± SD | Controls, n (%) | Mean ± SD | p-value* |
| Age | |||||
| 0–29 | 3 (11.1) | 4 (16.7) | |||
| 30–39 | 14 (51.9) | 36.8 ± 7.1 | 10 (41.7) | 36.8 ± 7.7 | |
| 40–50 | 10 (37.0) | 10 (41.7) | 0.728 | ||
| Gender | |||||
| Male | 18 (66.7) | – | 15 (62.5) | – | |
| Female | 9 (33.3) | 9 (37.5) | 0.756 | ||
| Physical Activity level | |||||
| Low | 22 (81.5) | – | 21 (87.5) | – | |
| High | 5 (18.5) | 3 (12.5) | 0.555 | ||
| HLA-B27 | |||||
| Positive | 21 (80.8) | ||||
| Negative | 5 (19.2) | – | – | – | |
| Not available | 1 | – | |||
| Body height (cm) | – | 170.4 ± 7.4 | – | 171.1 ± 8.8 | |
| Body weight (kg) | – | 75.9 ± 12.7 | – | 71.8 ± 12.9 | |
| BMI | |||||
| Low weight | 1 (4.2) | 1 (4.3) | |||
| Normoponderal | 11 (45.8) | 13 (56.5) | 24.5 ± 3.7 | 0.410 | |
| Overweight | 7 (29.2) | 26.2 ± 4.3 | 8 (34.8) | ||
| Obesity | 5 (20.8) | 1 (4.3) | |||
| Not available | 3 | 1 | |||
| BASDAI | |||||
| <4 | 22 (81.5) | 3.0 ± 2.0 | – | – | – |
| ≥4 | 5 (18.5) | ||||
| BASFI | |||||
| ≤4 | 23 (85.2) | 2.2 ± 2.7 | – | – | – |
| >4 | 4 (14.8) | ||||
| BASMI | |||||
| <3 | 24 (88.9) | 1.1 ± 1.3 | – | – | – |
| ≥3 | 3 (11.1) | ||||
*p-value determined by χ2-test.