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Table 1 Prevalence of nonradiographic axial spondyloarthritis among patients with inflammatory back pain across geographic regions

From: The prevalence and clinical characteristics of nonradiographic axial spondyloarthritis among patients with inflammatory back pain in rheumatology practices: a multinational, multicenter study

  Total Latin America Africa Europe Asia p Value
Overall sample       
 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   
 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   
 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)  
  1. nr-axSpA nonradiographic axial spondyloarthritis
  2. The p values represent the omnibus statistical comparison of percentages across geographic regions