| Age of workers | Hypertension | Total (n = 9285) | ||||
| Hypertensive (n = 2082) | Not hypertensive (n = 7203) | |||||
| effective | % | effective | % | effective | % | |
| ≤60 years old | 1527 | 73 | 5103 | 71 | 6630 | 71 |
| >60 years | 555 | 27 | 2100 | 29 | 2655 | 29 |