Study type:
Epidemiological study
(observational study)
Exposure to Magnetic Field Non-Ionizing Radiation and the Risk of Miscarriage: A Prospective Cohort Study.
epidem.
By:
Li DK, Chen H, Ferber JR, Odouli R, Quesenberry C
Published in: Sci Rep 2017; 7 (1): 17541
Aim of study (acc. to author)
Further details
Measurement days were divided into typical days (measurements were conducted during a typical day of the pregnancy) and non-typical days based on the participants' diaries.
Endpoint/type of risk estimation
Exposure
Assessment
Exposure groups
Group
|
Description
|
Reference group 1
|
99th percentile of exposure: < 0.25 µT (1st quartile)
|
Group 2
|
99th percentile of exposure: ≥ 0.25 µT
|
Reference group 3
|
99th percentile of exposure, typical day: < 0.25 µT (1st quartile)
|
Group 4
|
99th percentile of exposure, typical day: 0.25 - 0.36 µT (2nd quartile)
|
Group 5
|
99th percentile of exposure, typical day: 0.37 - 0.62 µT (3rd quartile)
|
Group 6
|
99th percentile of exposure, typical day: > 0.63 µT (4th quartile)
|
Population
-
Group:
-
Age:
≥ 18 years
-
Characteristics:
pregnant women with gestational age at pregnancy test of 10 complete weeks or less
-
Observation period:
not stated
-
Study location:
USA (San Francisco Bay Area)
-
Data source:
cohort of Kaiser Permanente Northern California, USA
Study size
Type |
Value |
Total |
1,627 |
Participants |
1,054 |
Evaluable |
913 |
Statistical analysis method:
- Cox proportional regressions analysis
(
adjustment:
- education
- maternal age, race, smoking since last menstrual period, prior miscarriage. Further adjustment for maternal nausea/vomiting, maternal income, marital status, alcohol use, caffeine intake, maternal fever, vaginal bleeding, urinary tract infection, carrying loads > 4.5 kg, exposure to solvents or degreasers, vitamin intake and Jacuzzi/hot tub/steam room/sauna use during pregnancy
)
Conclusion (acc. to author)
Study funded by
-
National Institute of Environmental Health Sciences (NIEHS), North Carolina, USA
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