Table 2. Childhood leukaemia mortality in west Cumbria by age and local authority area, in relation to the overlapping construction and operational phase of ordnance factories during 1941–1942: observed (O) and expected (E) numbers of deaths, O/E ratios and exact Poisson 95% confidence intervals (CI).
|
Age group
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|
|
1–4 years
|
5–14 years
|
Total (1–14 years)
|
|||||||
| 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 | 0.17 | 5.88 (0.29, 29.01) | 0 | 0.24 | 0 (0.00, 12.48) | 1 | 0.41 | 2.44 (0.12, 12.03) |
| Whitehaven MB | 1 | 0.11 | 9.09 (0.45, 44.84) | 1 | 0.15 | 6.67 (0.33, 32.88) | 2 | 0.26 | 7.69 (1.29, 25.41) |
| West Cumbria (Total) | 2 | 0.28 | 7.14 (1.20, 23.60)a | 1 | 0.39 | 2.56 (0.13, 12.65)b | 3 | 0.67 | 4.48 (1.14, 12.19)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 a8.00 (1.34, 26.43), b3.03 (0.15, 14.95) and c5.17 (1.32, 14.08).