Table 4 Exposure to High Magnetic Fields (MFs) During Pregnancy and the Risk of Miscarriage – Assessing Dose-Response, MF Measured on Typical Days Only.

From: Exposure to Magnetic Field Non-Ionizing Radiation and the Risk of Miscarriage: A Prospective Cohort Study

99th Percentile MF Level

Total N

Miscarriage N (%)

cHR (95% CI)

aHRa (95% CI)

1st quartile (<2.5 mG)

106

11 (10.4%)

Ref

Ref

2nd quartile (2.5–3.6 mG)

116

32 (27.6%)

2.87 (1.45–5.70)

3.29 (1.59–6.79)

3rd quartile (3.7–6.2 mG)

119

31 (26.1%)

2.70 (1.36–5.39)

3.01 (1.48–6.12)

4th quartile (≥6.3 mG)

112

21 (18.8%)

1.83 (0.88–3.79)

2.02 (0.95–4.28)

  1. cHR: crude (unadjusted) hazard ratio; aHR: adjusted hazard ratio. 95% CI: 95% Confidence interval.
  2. aAdjusted for maternal age at interview, race, education, smoking since LMP, and prior miscarriage.
  3. Further adjustment for the following variables did not change the results: maternal nausea/vomiting, maternal income, marital status, alcohol use, caffeine intake, maternal fever, vaginal bleeding, urinary tract infection, carrying loads > 10lbs, exposure to solvents or degreasers, vitamin intake and Jacuzzi/hot tub/steam room/sauna use during pregnancy.
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