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.