Spondyloarthropathy patient details of two populations of HLA-B27 positive Mexican Mestizo from Guadalajara and Mexico City
| Patients | M:F | Average age (range) | Age at onset (range) |
| Guadalajara | |||
| Total patients | 68:22 | 34.4 (16–59) | 23.4 (6–46) |
| AAU+ | 9:2 | 40.9 (21–54) | 24.7 (6–46) |
| AAU− | 59:20 | 33.5 (16–59) | 23.8 (6–46) |
| PA+ | 45:13 | 32.7 (16–56) | 20.6 (6–46) |
| PA− | 23:9 | 37.7 (21–59) | 27.4 (12–46) |
| Mexico City | |||
| Total patients* | 70:10 | 24.1 (11–55) | 16.1 (5–52) |
| AAU+ | 14:1 | 23.2 (15–44) | 15.6 (8–27) |
| AAU− | 56:9 | 24.3 (11–55) | 16.1 (5–52) |
| Undifferentiated spondyloarthropathy | 17:3 | 22.9 (14–55) | 16.9 (8–52) |
AAU = acute anterior uveitis, PA = peripheral arthritis. *93.8% of Mexico City patients had peripheral arthritis.