Table 2 Exposure to High Magnetic Fields (MFs) During Pregnancy and the Risk of Miscarriage.

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)

Among all participants

Lowest quartile

219

36 (16.4%)

Ref

Ref

Higher quartiles

694

164 (23.6%)

1.43 (1.00–2.06)

1.48 (1.03–2.14)

MF measured on typical days

Lowest quartile

106

11 (10.4%)

Ref

Ref

Higher quartiles

347

84 (24.2%)

2.46 (1.31–4.62)

2.72 (1.42–5.19)

MF measured on non-typical days

Lowest quartile

113

25 (22.1%)

Ref

Ref

Higher quartiles

347

80 (23.1%)

1.02 (0.65–1.62)

1.08 (0.67–1.73)

  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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