Standardised mortality ratios (SMRs) for the total study cohort (n=83 997) by period from hire and by year of death: study of United Kingdom electricity generation and transmission workers, 1973–97
| All leukaemia5-151 | All causes | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Obs | Exp | SMR | (95% CI) | Obs | Exp | SMR | (95% CI) | ||
| Period from hire (y): | |||||||||
| 0–9 | 6 | 11.8 | 51 | (19 to 110) | 829 | 1133.1 | 735-165 | (68 to 78) | |
| 10–19 | 34 | 32.1 | 106 | (73 to 148) | 3326 | 4024.7 | 835-165 | (80 to 85) | |
| 20–29 | 37 | 40.7 | 91 | (64 to 125) | 4864 | 5688.9 | 865-165 | (83 to 88) | |
| ⩾30 | 34 | 47.6 | 715-150 | (49 to 100) | 5826 | 7071.8 | 825-165 | (80 to 85) | |
| Year of death: | |||||||||
| 1973–80 | 13 | 18.3 | 71 | (38 to 121) | 1947 | 2467.3 | 795-165 | (75 to 82) | |
| 1981–85 | 27 | 24.7 | 109 | (72 to 159) | 2794 | 3301.6 | 855-165 | (82 to 88) | |
| 1986–90 | 29 | 31.7 | 92 | (61 to 132) | 3617 | 4312.5 | 845-165 | (81 to 87) | |
| 1991–97 | 42 | 57.6 | 735-150 | (53 to 99) | 6487 | 7837.0 | 835-165 | (81 to 85) | |
| Total | 111 | 132.3 | 84 | (69 to 101) | 14845 | 17918.4 | 835-165 | (82 to 84) | |