| Age group (years) | Urine samples examined | Positive (%) | Negative (%) |
| 40 - 49 | 60 | 12 (20.0) | 48 (80.0) |
| 50 - 59 | 77 | 21 (27.3) | 56 (72.7) |
| 60 - 69 | 110 | 46 (41.8) | 64 (58.2) |
| 70 - 79 | 94 | 67 (71.3) | 27 (28.7) |
| 80 - 89 | 22 | 15 (68.2) | 7 (31.8) |
| 90 - 99 | 5 | 5 (100) | 0 |
| Total | 368 | 166 (45.1) | 202 (54.9) |