Re-examining the association between residential exposure to magnetic fields from power lines and childhood asthma in the Danish National Birth Cohort.
Published in: PLoS One 2017; 12 (5): e0177651
Aim of study (acc. to author)
Asthma cases were identified using 3 independent data sources: mothers' reports, a national hospitalization registry and a national prescription drug
registry. A definitive asthma case was a child
who had an asthma diagnosis
in all of the three data sources.
Endpoint/type of risk estimation
- calculation: distance from the residence to the nearest power line based on GPS data, estimated magnetic flux densities based on line configurations, historical loading, phasing and direction of current flow provided by utility companies
Reference group 1
magnetic field strength: no exposure
magnetic field strength: 0.1 µT
magnetic field strength: ≥ 0.2 µT
cohort of mothers and newborns, enrolled between 1996 and 2002, follow-up at the age of 7 years
1996 - 2002
Danish National Birth Cohort
Statistical analysis method:
- Cox proportional regressions analysis
Conclusion (acc. to author)
Study funded by
Electric Power Research Institute (EPRI), USA
Li DK et al.
Maternal exposure to magnetic fields during pregnancy in relation to the risk of asthma in offspring.