# ELF-003 — Personal magnetic measurements during pregnancy

Why this matters
This retrieval lead asks whether short peaks in magnetic-field exposure during pregnancy relate to miscarriage. The reported association used the maximum reading rather than the daily average. Checking the original measurement-day selection and analyses is essential before drawing a health conclusion from such a sensitive outcome.

Id: ELF-003

Author: Li et al.

Full Authors: De-Kun Li; Roxana Odouli; Soora Wi; Teresa Janevic; Ira Golditch; T. Dan Bracken; Russell Senior; Richard Rankin; Richard Iriye

Year: 2002

Title: A Population-Based Prospective Cohort Study of Personal Exposure to Magnetic Fields during Pregnancy and the Risk of Miscarriage

Journal: epidemiology

Citation: Li DK, Odouli R, Wi S, Janevic T, Golditch I, Bracken TD, Senior R, Rankin R, Iriye R. A Population-Based Prospective Cohort Study of Personal Exposure to Magnetic Fields during Pregnancy and the Risk of Miscarriage. Epidemiology. 2002;13(1):9-20. doi:10.1097/00001648-200201000-00004.

Doi: 10.1097/00001648-200201000-00004

Pmid: 11805581

Topic: Power frequency fields

Verification Group: Retrieval lead

Record Role: Retrieval lead

Featured: False

Exposure: 24-hour personal monitoring during early pregnancy.

Design: Prospective cohort; 969 participants reported in discovery dossier.

Finding: Discovery dossier reports a miscarriage association with maximum, rather than average, measured magnetic field.

Boundary: Original methods and exposure-day selection need checking before featuring.

Protection Question: Does a maximum magnetic-field reading capture a relevant pregnancy exposure or a measurement-day artefact? Original methods and exposure-day selection remain to be checked before this retrieval lead informs a health conclusion.

Access: Record verified; full text still required

Notice: Primary PubMed linked-notice record checked 20 Oct 2026; no correction, concern or retraction linked at check. This is not an exhaustive publisher-history certification.

Funding: Not established from retrieved material.

Conflicts: Not established from retrieved material.

Source Url: https://doi.org/10.1097/00001648-200201000-00004

Retrieval Links: https://doi.org/10.1097/00001648-200201000-00004 | https://pubmed.ncbi.nlm.nih.gov/11805581/

Verification Date: 2026-10-20