Table 1 Prevalence of nonradiographic axial spondyloarthritis among patients with inflammatory back pain across geographic regions
| Â | Total | Latin America | Africa | Europe | Asia | p Value |
|---|---|---|---|---|---|---|
Overall sample | Â | Â | Â | Â | Â | Â |
 Number of patients | 914 | 26 | 206 | 298 | 384 |  |
 nr-axSpA, n (%) | 266 (29.10 %) | 5 (19.23 %) | 33 (16.02 %) | 88 (29.53 %) | 140 (36.46 %) | <0.001 |
 95 % CI | (26.15–32.05) | (4.05–34.41) | (11.00–21.04) | (24.34–34.72) | (31.64–41.28) |  |
Among males | Â | Â | ||||
 Number of patients | 588 | 12 | 116 | 204 | 256 |  |
 nr-axSpA, n (%) | 169 (28.74 %) | 4 (33.33 %) | 18 (15.52 %) | 57 (27.94 %) | 90 (35.16 %) | <0.001 |
 95 % CI | (25.07–32.41) | (6.58–60.08) | (8.91–22.13) | (21.77–34.12) | (29.29–41.02) |  |
Among females | Â | Â | ||||
 Number of patients | 326 | 14 | 90 | 94 | 128 |  |
 nr-axSpA, n (%) | 97 (29.75 %) | 1 (7.14 %) | 15 (16.67 %) | 31 (32.98 %) | 50 (39.06 %) | <0.001 |
 95 % CI | (24.77–34.74) | (0.00–20.70) | (8.93–24.41) | (23.42–42.53) | (30.57–47.56) |  |