Study type: Epidemiological study (observational study)

Stillbirth and residential proximity to extremely low frequency power transmission lines: a retrospective cohort study. epidem.

Published in: Occup Environ Med 2012; 69 (2): 147-149

Aim of study (acc. to author)

The association between stillbirth and residential proximity to extremely low frequency power transmission lines was investigated in cohort study in Canada.

Further details

Stillbirths were classified in early preterm (< 28 pregnancy weeks), late preterm (28 - 36 weeks) and term (≥ 37 weeks) stillbirths.

Endpoint/type of risk estimation

Type of risk estimation: (odds ratio (OR))

Exposure

Assessment

Exposure groups

Group Description
Group 1 residential distance to power lines: < 25 m
Group 2 residential distance to power lines: 25 - 49.9 m
Group 3 residential distance to power lines: 50 - 74.9 m
Group 4 residential distance to power lines: 75 - 99.9 m
Reference group 5 residential distance to power lines: ≥ 100 m

Population

Study size

Type Value
Total 2,033
Statistical analysis method: ( adjustment: )

Conclusion (acc. to author)

3.5 % of the stillbirths (n=72) were within 100 m distance between residence and power lines, 0.8 % of the stillbirths (n=16) within 25 m of power lines.
The results showed no association between preterm stillbirth and residential proximity to extremely low frequency power transmission lines. The risk of term stillbirth for the distance less than 25 m was greater compared to 100 m and more (OR 2.25; CI 1.14 - 4.45), but no dose-response pattern was apparent.
The authors concluded that a relationship between stillbirth and residential proximity to power transmission lines is unlikely as a mechanism operating through term, but not preterm stillbirth is difficult to identify.

Study funded by

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