| Age group (years) | Urine examined | Positive (%) | Negative (%) |
| 40 - 49 | 60 | 4 (6.7) | 56 (93.3) |
| 50 - 59 | 77 | 7 (7.1) | 70 (90.9) |
| 60 - 69 | 110 | 20 (18.2) | 90 (81.8) |
| 70 - 79 | 94 | 20 (21.3) | 74 (78.7) |
| 80 - 89 | 22 | 8 (36.4) | 14 (63.6) |
| 90 - 99 | 5 | 1 (20.0) | 4 (80.0) |
| Total | 368 | 60 (16.3) | 308 (83.7) |