Study type: Epidemiological study (observational study)

Residential proximity to high-voltage power lines and risk of childhood hematological malignancies epidem.

By: Mizoue T, Onoe Y, Moritake H, Okamura J, Sokejima S, Nitta H
Published in: J Epidemiol 2004; 14 (4): 118-123
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Aim of study (acc. to author)

The possible association between residence in districts close to high-voltage power lines and the risk of childhood hematological malignancies was investigated in a Japanese study.

Further details

The exposure to magnetic fields was assessed at small district level: the city was divided into 294 districts which were categorized into more than half and less than half of the area within 300 m of high-voltage power lines. For patients residing within 100 m of power lines measurements of magnetic fields were performed.

Endpoint/type of risk estimation

Type of risk estimation: (rate ratio)

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 home at diagnosis not in area within 300 m to power lines
Group 2 home at diagnosis in area where < 50 % of the area is within 300 m to power lines
Group 3 home at diagnosis in area where ≥ 50 % of the area is within 300 m to power lines
Reference group 4 home for longest interval not in area within 300 m to power lines
Group 5 home for longest interval in area where < 50 % of the area is within 300 m to power lines
Group 6 home for longest interval in area where ≥ 50 % of the area is within 300 m to power lines

Population

Study size

Type Value
Total 14
Statistical analysis method:

Results (acc. to author)

6 of the children lived in areas more than 300 m away from high-voltage power lines.
Among children who lived in districts closer than 300 m to high-voltage power lines a non-significantly increased risk for childhood hematological malignancies was found.

Limitations (acc. to author)

The results are based on small numbers.

Study funded by

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