Table 1 Distribution of the cases and controls by category of uncertainty of location by geocoding
From: Childhood leukaemia close to high-voltage power lines – the Geocap study, 2002–2007
Cases | Controls | ||||
|---|---|---|---|---|---|
Category of accuracy of address location for geocoding | Uncertainty | N | % | N | % |
At the exact number | 20 m | 1946 | 70.0 | 23 171 | 77.2 |
In a section of a short street | 50 m | 173 | 6.2 | 1658 | 5.5 |
At a close number | 100 m | 130 | 4.7 | 801 | 2.7 |
In a medium street or in a hamlet | 300 m | 394 | 14.2 | 3693 | 12.3 |
In a long street | 500 m | 54 | 1.9 | 383 | 1.3 |
In a Commune | 82 | 3.0 | 292 | 1.0 | |
Total | 2779 | 100.0 | 30 000 | 100.0 | |
