Demographic characteristics of the 3439 patients with ankylosing spondylitis. Results are mean ± SD unless otherwise specified. HLA-B27 in Latin American (LA) cohort calculated in only 570 patients.
| Characteristics | EU, n = 2356 | LA, n = 1083 | p | Mean (95% CI) |
|---|---|---|---|---|
| Sex male, % | 72 | 75 | 0.78 | 2.9 (0.3–6) |
| Age, yrs | 47 ± 12 | 43 ± 14 | < 0.001 | 3.5 (2–5) |
| Age at symptom onset, yrs | 27 ± 11 | 28 ± 12 | < 0.001 | 1.5 (0.7–2.4) |
| Age at diagnosis, yrs | 34 ± 12 | 35 ± 13 | 0.013 | 1.3 (0.3–2.3) |
| HLA-B27, % | 83 | 71 | < 0.001 | 11.4 (7–15.6) |
EU: European cohort.