Results are presented in mean ± standard deviation for continuous variables and n (%) for categorical variables
| Both, | Only | Only undifferentiated | p value* | |
|---|---|---|---|---|
| nr-axSpA & undifferentiated SpA | nr-axSpA | SpA | ||
| N (%) = 94 | N (%) = 88 | N (%) = 72 | ||
| Age (years) | 30.9±7.3 | 32.2±6.9 | 35.2±6.9 | <0.01 |
| Male | 61 (64.9) | 50 (56.8) | 34 (47.2) | 0.2 |
| Family history | 48 (51.1) | 21 (23.9) | 30 (41.7) | <0.05 |
| HLA-B27 | 81 (86.2) | 65 (73.9) | 6 (8.3) | <0.001 |
| Enthesitis | 29 (30.9) | 18 (20.5) | 22 (30.6) | 0.1 |
| BASDAI | 3.7±2.3 | 3.8±2.1 | 4.7±2.3 | <0.01 |
| BASFI | 2.2±2.2 | 2.1±2.1 | 2.9±2.5 | <0.05 |
| ASQoL | 5.9±4.7 | 5.2±4.5 | 7.4±5.2 | 0.01 |
| CRP (mg/L) | 10.7±14.3 | 9.8±16.5 | 5.1±9.1 | <0.05 |
*p value for differences between nr-axSpA and undifferentiated SpA (Student-t test for continuous variables and Pearson Chi-square test for categorical variables).