| Past history | Frequencies | Percentages | |
| Bilharzia | Processed | 130/165 | 78.8 |
| Untreated | 15/165 | 9.1 | |
| Recurrent urinary tract infections | 25/165 | 15.1 | |
| Prostatic hypertrophy | 20/165 | 12.1 | |
| Treated bladder lithiasis | 3/165 | 1.8 | |