Table 1. Childhood leukaemia mortality in west Cumbria by age and local authority area, in relation to the construction of ordnance factories in 1940–43: observed (O) and expected (E) numbers of deaths, O/E ratios and exact Poisson 95% confidence intervals (CI).
|
Age group
|
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|---|---|---|---|---|---|---|---|---|---|
|
1–4 years
|
5–14 years
|
Total (1–14 years)
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| Local authority area | O | E * | O/E (95% CI) | O | E * | O/E (95% CI) | O | E * | O/E (95% CI) |
| Ennerdale and Millom RDs | 1 | 0.37 | 2.70 (0.14, 13.33) | 0 | 0.49 | 0 (0.00, 6.11) | 1 | 0.86 | 1.16 (0.06, 5.73) |
| Whitehaven MB | 1 | 0.22 | 4.55 (0.23, 22.42) | 1 | 0.29 | 3.45 (0.17, 17.01) | 2 | 0.51 | 3.92 (0.66, 12.96) |
| West Cumbria (Total) | 2 | 0.59 | 3.39 (0.57, 11.20)a | 1 | 0.78 | 1.28 (0.06, 6.32)b | 3 | 1.37 | 2.19 (0.56, 5.96)c |
CI=confidence intervals; MB=Municipal Borough; RD=Rural District.
*
Expected numbers of deaths, E, calculated by Method A (see Materials and Methods). By Method B, the O/E ratios and 95% CI are a3.70 (0.62, 12.24), b1.47 (0.07, 7.25); and c2.46 (0.63, 6.69).