Table 1.
Baseline demographics of patients with axSpA at enrollment, stratified by enthesitis status
| Characteristic | Patients with axSpAa | P valueb | |
|---|---|---|---|
| With enthesitis (n = 121) | No enthesitis (n = 356) | ||
| Nonradiographic axSpA, n (%) | 34 (28.1) | 56 (15.7) | <0.01 |
| Age, mean (SD), yearsc | 47.3 (13.1) | 47.3 (14.1) | 0.99 |
| Female, n (%) | 61 (50.4) | 112 (31.9) | <0.01 |
| White, n (%) | 105 (88.2) | 319 (92.7) | 0.16 |
| Attended college/university, n (%) | 92 (76.7) | 236 (67.0) | 0.09 |
| Private insurance, n (%) | 96 (82.1) | 276 (81.9) | 0.12 |
| Work status, n (%) | n = 121 | n = 351 | 0.30 |
| Full time | 69 (57.0) | 214 (61.0) | |
| Part time | 7 (5.8) | 22 (6.3) | |
| Disabled | 24 (19.8) | 42 (12.0) | |
| Retired | 12 (9.9) | 44 (12.5) | |
| Other | 9 (7.4) | 29 (8.3) | |
| BMI, mean (SD), kg/m2 | 29.9 (6.9) | 29.8 (6.8) | 0.83 |
| BMI (in kg/m2) categories, n (%) | n = 120 | n = 345 | 0.46 |
| Normal/underweight (<25) | 33 (27.5) | 86 (24.9) | |
| Overweight (25 to <30) | 33 (27.5) | 116 (33.6) | |
| Obese (≥30) | 54 (45.0) | 143 (41.4) | |
Abbreviation: axSpA, axial spondyloarthritis; BMI, body mass index.
a
All values were calculated based on available data and had less than 20% missing data.
b
P value for comparison between patients with versus those without enthesitis. The Wilcoxon rank‐sum test was used for continuous variables, whereas the χ2 test was used for categorical variables. For variables where more than 20% of the cells had expected counts less than five, the Fisher exact test was used.
c
t test for age comparison between pairs of groups.