|Group 1||distance from municipality to high-power lines: < 5 km|
|Group 2||distance from municipality to high-power lines: ≥ 5 - < 7.5 km|
|Group 3||distance from municipality to high-power lines: > 7.5 - < 10 km|
|Group 4||distance from municipality to high-power lines < 10 km and power plant < 7.5 km|
The standardized incidence rate (SIR) for acute leukemia was 5.1 cases per 100,000, surpassing the Spanish, European and world average rates (no data given in the publication). The standardized incidence rate for acute myeloid leukemia in the municipalities situated less than 5 km away from high-power lines was 5.6 cases per 100,000; in a distance less than 7.5 km 3.0 cases per 100,000, and in a distance less than 10 km 4.7 cases per 100,000. Interaction between the distance from a municipality to high-power lines less than 10 km and to a power plant less than 7.5 km was observed.
The analysis of the correlation between the annual standardized incidence rate for acute lymphoblastic leukemia and air distance to high-power lines or other industrial plants did not show any statistically significant results.
Exposure assessment is based on data at municipality level instead of individual patient data. No measurements of magnetic field strength were conducted. The results can be confounded because occupational exposure is not included in the analysis due to lack of a detailed job history.