Standardised mortality ratios (SMR) of IHD in different cohort of female workers followed until the end of 1995
| Cohort | Observed | Expected | SMR | 95% CI |
|---|---|---|---|---|
| 6242 female livestock workers in 1970 census | 305 | 278.0 | 1.10 | 0.98 to 1.23 |
| 36080 female agricultural workers in 1970 census | 1791 | 1820.7 | 0.98 | 0.94 to 1.03 |
| 3153 female agricultural and livestock workers in 1990 census | 4 | 1.5 | 2.64 | 0.72 to 6.77 |