HLA-B27 antigen and the duration and laterality of uveitis
| Classification | No of patients tested for HLA-B27/total no | No of HLA-B27 positive in tested (%) |
| Acute/recurrent unilateral | 92/111 | 73 (79) |
| Acute/recurrent bilateral | 17/18 | 2 (12) |
| Chronic unilateral | 30/36 | 2 (7) |
| Chronic bilateral | 47/55 | 4 (9) |
| Total | 186/220 | 81 (44) |