|  | New Patients (n = 926) | Re-treatment Patients (n = 236) | ||||
---|---|---|---|---|---|---|---|
Factor | Cases (n = 160) | Controls (n = 766) | Stratum specific OR (95% CI) | Cases (n = 71) | Controls(n = 165) | Stratum specific OR 95% CI | |
Sex | Male | 100/160 | 398/766 | 1.5 (1.1-2.2) | 54/71 | 118/165 | 1.3 (0.6-2.3) |
 | Female | 60/160 | 368/766 | 1.0 | 17/71 | 47/165 | 1.0 |
Median age | 30 | 34 | p = 0.001 | 33 | 39 | p = 0.003 |