6,486 Studies Reviewed. 85.2% of Original Studies Found Biological Effects. The Evidence is Clear.
Shield Your Body

Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

Reproductive Health

Congenital malformations and exposure to high-frequency electromagnetic radiation among Danish physiotherapists.

No Effects Found

Larsen AI · 1991

View Original Abstract
Share:

This study found no significant link between high-frequency EMF exposure and birth defects, but small sample size limits conclusions.

Plain English Summary

Summary written for general audiences

Danish researchers studied 54 physiotherapists who gave birth to children with congenital malformations and 247 who had healthy babies, examining whether exposure to high-frequency electromagnetic radiation during the first month of pregnancy increased birth defect risk. They found no statistically significant link between EMF exposure and birth defects (odds ratio 1.7 with a confidence interval that included no effect). This suggests that the high-frequency electromagnetic devices commonly used in physiotherapy practice may not increase the risk of congenital malformations.

Why This Matters

This 1991 study represents an important early investigation into EMF exposure during pregnancy, triggered by concerns from a cluster of birth defects among physiotherapists. While the researchers found no statistically significant association, the odds ratio of 1.7 suggests a possible increased risk that the study may have been too small to detect reliably. The reality is that physiotherapists regularly use high-frequency electromagnetic devices like diathermy equipment, which can produce substantial EMF exposures. What this means for you is that while this single study provides some reassurance, the limitations of sample size and the era's less sophisticated exposure assessment methods mean we shouldn't consider this the final word on EMF and pregnancy outcomes. The broader body of research on EMF and reproductive health has grown considerably since 1991, with more recent studies showing concerning associations that warrant precautionary approaches during pregnancy.

Study Details

A cluster initiated the present case-referent study to assess the relation between exposure to high-frequency electromagnetic radiation and congenital malformations

Through the linkage of a cohort formed from a union file of Danish physiotherapists with complete na...

No statistically significant associations between pregnancy outcome and high-frequency electromagnet...

Cite This Study
Larsen AI (1991). Congenital malformations and exposure to high-frequency electromagnetic radiation among Danish physiotherapists. Scand J Work Environ Health 17(5):318-323, 1991.
Show BibTeX
@article{ai_1991_congenital_malformations_and_exposure_3180,
  author = {Larsen AI},
  title = {Congenital malformations and exposure to high-frequency electromagnetic radiation among Danish physiotherapists.},
  year = {1991},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/1947917/},
}
PubMed: 1947917

Cited By (44 papers)

Quick Questions About This Study

A 1991 Danish study of 301 physiotherapists found no statistically significant link between high-frequency electromagnetic radiation exposure during early pregnancy and birth defects. The research showed an odds ratio of 1.7 but with confidence intervals that included no effect.
Research on Danish physiotherapists exposed to high-frequency electromagnetic devices during pregnancy showed no significant increase in congenital malformations. The study compared 54 mothers with affected babies to 247 with healthy babies, finding no clear risk.
A study of Danish physiotherapists using high-frequency electromagnetic equipment found no statistically significant association with birth defects. Researchers examined exposure during the first month of pregnancy and concluded the devices may not increase malformation risk.
Danish research on physiotherapists exposed to high-frequency electromagnetic radiation during early pregnancy found no statistically significant increased risk of congenital malformations. The study's odds ratio of 1.7 had confidence intervals that crossed the no-effect threshold.
A 1991 study examining high-frequency electromagnetic radiation exposure among Danish physiotherapists during early pregnancy found no significant impact on fetal development. Researchers compared birth outcomes and found no clear link to congenital malformations.