Table 3.
Demographic characteristics of patients with nonradiographic axial spondyloarthritis across geographic regions
| Africa (n = 33) | Europe (n = 88) | Asia (n = 140) | p Value | |
|---|---|---|---|---|
| Sex | 0.609 | |||
| Male, n (%) | 18 (54.55 %) | 57 (64.77 %) | 90 (64.29 %) | |
| 95 % CI | (37.45–71.64) | (54.73–74.82) | (56.30–72.27) | |
| Female (%) | 15 (45.45 %) | 31 (35.23 %) | 50 (35.71 %) | |
| 95 % CI | (28.36–62.55) | (25.18–45.27) | (27.73–43.70) | |
| Age, years mean ± SD | 36.67 ± 10.73 | 36.02 ± 10.56 | 33.24 ± 9.26 | 0.035 |
| BMI category | 0.21 | |||
| Underweight, n (%) | 1 (3.03 %) | 4 (4.55 %) | 7 (5.00 %) | |
| 95 % CI | (0.00–8.92) | (0.17–8.93) | (1.37–8.63) | |
| Normal weight, n (%) | 16 (48.48 %) | 51 (57.95 %) | 81 (57.86 %) | |
| 95 % CI | (31.32–65.65) | (47.57–68.34) | (49.62–66.09) | |
| Overweight, n (%) | 13 (39.39 %) | 19 (21.59 %) | 44 (31.43 %) | |
| 95 % CI | (22.61–56.17) | (12.94–30.24) | (23.69–39.17) | |
| Obese, n (%) | 2 (6.06 %) | 14 (15.91 %) | 7 (5.00 %) | |
| 95 % CI | (0.00–14.25) | (8.22–23.6) | (1.37–8.63) | |
| Unknown, n (%) | 1 (3.03 %) | 0 (0.00 %) | 1 (0.71 %) | |
| 95 % CI | (0.00–8.92) | – | (0.00–2.12) | |
| Years since CLBP presentation | 0.462 | |||
| Number of patients | 29 | 74 | 124 | |
| Mean ± SD, years | 8.02 ± 10.01 | 6.68 ± 9.33 | 5.67 ± 5.70 | |
| Age of IBP onset | 0.115 | |||
| Number of patients | 33 | 87 | 139 | |
| Mean ± SD, years | 28.4 ± 8.7 | 28.3 ± 6.5 | 27.1 ± 7.3 |
BMI body mass index, CLBP chronic low back pain
The p values represent the omnibus statistical comparison of percentages (or means) across regions based on the chi-square (or F-test) values