Table 3 Exposure to High Magnetic Fields (MFs) During Pregnancy and the Risk of Miscarriage, Stratified by Number of Prior Miscarriages, 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)
≤1 prior miscarriages
Lowest quartile 39 3 (7.7%) Ref Ref
Higher quartiles 143 27 (18.9%) 2.69 (0.82–8.87) 3.76 (1.07–13.18)
≥2 prior miscarriages
Lowest quartile 67 8 (11.9%) Ref Ref
Higher quartiles 204 57 (27.9%) 2.43 (1.16–5.11) 2.56 (1.19–5.50)
  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 gravidity.
  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.