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Occup Environ Med 61:174-176 doi:10.1136/oem.2002.006239
  • Short report

Risk of selected birth defects by maternal residence close to power lines during pregnancy

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 defects Crude Adjusted*
No. cases OR 95% CI No. cases OR 95% CI
*Adjusted for highest family educational level and mother’s age.
All CNS defects 51 0.87 0.34 to 2.17 49 0.86 0.33 to 2.29
Anencephalus 13 1.00 0.16 to 6.42 12 1.09 0.15 to 8.08
Spina bifida 19 0.43 0.08 to 2.31 19 0.60 0.10 to 3.47
Hydrocephalus 14 1.88 0.39 to 8.92 13 1.73 0.26 to 11.64
Cardiac defects 103 1.54 0.89 to 2.67 102 1.54 0.89 to 2.68
Respiratory system defects 40 0.84 0.30 to 2.34 39 0.79 0.28 to 2.23
Oesophageal defects 12 0.29 0.04 to 2.32 10 0.41 0.03 to 5.15
Clubfoot 270 0.84 0.57 to 1.23 269 0.82 0.56 to 1.21

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