Study type: Epidemiological study (observational study)

Age of exposure to infections and risk of childhood leukaemia. epidem.

Published in: BMJ 1993; 307 (6907): 774

Aim of study (acc. to author)

A case-control study was conducted in Greece to determine potential risk factors for childhood leukemia. The main focus of the study was on the risk factor infections, however exposure to magnetic fields as a possible risk factor was also investigated.

Further details

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Endpoint/type of risk estimation

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 distance from power lines: ≥ 50 m
Group 2 distance from power lines: 5 - 49 m
Group 3 distance from power lines: < 5 m
Reference group 4 distance from electricity substation: ≥ 100 m
Group 5 distance from electricity substation: < 100 m

Population

Case group

Control group

Study size

Cases Controls
Eligible 183 -
Participants 136 187
Statistical analysis method:

Conclusion (acc. to author)

The results for the two exposure sources of magnetic fields suggested opposite conclusions. Children living in a distance of less than 100 m from an electrical substation had a non-significant decreased risk of childhood leukemia (RR 0.35, CI 0.12-1.08) whereas children living in a distance of less than 5 m from power lines showed a slight, but non-significant increase in the relative risk of childhood leukemia (RR 1.19, CI 0.59-2.41).

Study funded by

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