Table 1

Odds ratios of selected birth defects by maternal residential exposure to magnetic fields above 0.1 μT in Norway 1980–1997

Category of birth defectsCrudeAdjusted*
No. casesOR95% CINo. casesOR95% CI
*Adjusted for highest family educational level and mother’s age.
All CNS defects510.870.34 to 2.17490.860.33 to 2.29
Anencephalus131.000.16 to 6.42121.090.15 to 8.08
Spina bifida190.430.08 to 2.31190.600.10 to 3.47
Hydrocephalus141.880.39 to 8.92131.730.26 to 11.64
Cardiac defects1031.540.89 to 2.671021.540.89 to 2.68
Respiratory system defects400.840.30 to 2.34390.790.28 to 2.23
Oesophageal defects120.290.04 to 2.32100.410.03 to 5.15
Clubfoot2700.840.57 to 1.232690.820.56 to 1.21