Standardised mortality ratios (SMR) of IHD in different cohorts of male workers followed until the end of 1995
| Cohort | Observed | Expected | SMR | 95% CI |
|---|---|---|---|---|
| 3015 male livestock workers in 1970 census | 353 | 332.8 | 1.06 | 0.95 to 1.18 |
| 22663 male agricultural workers in 1970 census | 2122 | 2113.6 | 1.00 | 0.96 to 1.05 |
| 8218 male agricultural and livestock workers in 1990 census | 27 | 22.5 | 1.20 | 0.79 to 1.75 |