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Table 3 Demographic characteristics of patients with nonradiographic axial spondyloarthritis 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

  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  
  1. BMI body mass index, CLBP chronic low back pain
  2. The p values represent the omnibus statistical comparison of percentages (or means) across regions based on the chi-square (or F-test) values