From “A pooled analysis of magnetic fields and childhood leukaemia”, Ahlbom et al, British Journal of Cancer (2000) vol 83 pp 692-698
Based on Table 3 from the published paper.
Total leukaemia. Relative risks (95% confidence interval in parentheses) by exposure level with adjustment for age, sex and socioeconomic status (measurement studies) and East/West in Germany. Reference level: <0.1 µT. Observed and expected case numbers ≥ 0.4 µT, with expected numbers given by modelling probability of membership of each exposure category based on distribution of controls including covariates.
| Type of study |
0.1-<0.2 µT |
0.2-<0.4 µT |
≥ 0.4 µT |
≥ 0.4 µT |
|
Observed |
Expected |
| Measurement studies |
|
Canada
|
1.29 (0.84-1.99) |
1.39 (0.78-2.48) |
1.55 (0.65-3.68) |
13 |
10.3 |
Germany
|
1.24 (0.58-2.62)
|
1.67 (0.48-5.83)
|
2.00 (0.26-15.17)
|
2
|
0.9 |
New Zealand
|
0.67 (0.20-2.20)
|
4 cases/0 ctrls
|
0 cases/0 ctrls
|
0
|
0 |
UK
|
0.84 (0.57-1.24)
|
0.98 (0.50-1.93)
|
1.00 (0.30-3.37)
|
4
|
4.4 |
| USA |
1.11 (0.81-1.53) |
1.01 (0.65-1.57) |
3.44 (1.24-9.54) |
17 |
4.7 |
| Calculated field studies |
|
Denmark |
2.68 (0.24-30.45) |
0 cases/8 ctrls |
2 cases/0 ctrls |
2 |
0 |
| Finland |
0 cases/19 ctrls |
4.11 (0.48-35.1) |
6.21 (0.68-56.9) |
1
|
0.2
|
| Norway |
1.75 (0.65-4.72) |
1.06 (0.21-5.22) |
0 cases/10 ctrls |
0
|
2.7
|
| Sweden |
1.75 (0.48-6.37) |
0.57 (0.07-4.65) |
3.74 (1.23-11.37) |
5 |
1.5 |
| Summary |
|
Measurements studies |
1.05 (0.86-1.28)
|
1.15 (0.85-1.54)
|
1.87 (1.10-3.18)
|
36
|
20.1
|
| Calculated field studies |
1.58 (0.77-3.25) |
0.79 (0.27-2.28) |
2.13 (0.93-4.88) |
8 |
4.4 |
| All studies |
1.08 (0.89-1.31) |
1.11 (0.84-1.47) |
2.00 (1.27-3.13) |
44 |
24.2 |
The results for “all studies” are shown in this graph: