Document Detail

Miscarriages among female physical therapists who report using radio- and microwave-frequency electromagnetic radiation.
MedLine Citation:
PMID:  8237966     Owner:  NLM     Status:  MEDLINE    
Physical therapists are exposed to radio- and microwave-frequency electromagnetic radiation by operating shortwave and microwave diathermy units. Recent studies suggest that use of shortwave diathermy is associated with an excess risk of birth defects, perinatal deaths, and late spontaneous abortions among the offspring of exposed female therapists. To assess the impact of occupational use of microwave and shortwave diathermy at the time of conception, the authors mailed questionnaires to 42,403 physical therapists in 1989. Both occupational and reproductive histories were obtained. Exposures to shortwave and microwave diathermy were both assessed in the same fashion and were examined in relation to early recognized fetal loss in a nested case-control design. A total of 1,753 case pregnancies (miscarriages) were matched to 1,753 incidence density control pregnancies (other pregnancies except ectopic pregnancies). A pregnancy was considered "exposed" if the mother reported using microwave or shortwave diathermy anytime during the 6 months prior to the first trimester or during the first trimester. Pregnancies of mothers reporting microwave use 6 months prior to the pregnancy or during the first trimester were more likely to result in miscarriage (odds ratio (OR) = 1.28, 95% confidence interval (CI) 1.02-1.59). The odds ratio increased with increasing level of exposure (chi 2 = 7.25, p < 0.005). The odds ratio in the highest exposure group (20 or more exposures/month) was 1.59. The overall odds ratio was slightly lower after it was controlled for prior fetal loss (OR = 1.26, 95% CI 1.00-1.59), but the exposure-response effect remained (chi 2 = 5.17, p < 0.01). The risk of miscarriage was not associated with reported use of shortwave diathermy equipment (OR = 1.07, 95% CI 0.91-1.24). The odds ratio in the highest exposure group was 0.87.
R Ouellet-Hellstrom; W F Stewart
Related Documents :
16891296 - A meta-analysis of pregnancy outcomes in women with polycystic ovary syndrome.
17970796 - Prevalence of undiagnosed autoimmune rheumatic diseases in the first trimester of pregn...
12757506 - Will it ever be possible to balance the risk of intracranial haemorrhage in fetal or ne...
1477016 - Perinatal outcome of pregnancies complicated by vaginal bleeding.
20504096 - Effects of early pregnancy loss on hormone levels in the subsequent menstrual cycle.
17614496 - Steering vector sensor array elements with linear cardioids and nonlinear hippioids.
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American journal of epidemiology     Volume:  138     ISSN:  0002-9262     ISO Abbreviation:  Am. J. Epidemiol.     Publication Date:  1993 Nov 
Date Detail:
Created Date:  1993-12-22     Completed Date:  1993-12-22     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7910653     Medline TA:  Am J Epidemiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  775-86     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Abortion, Spontaneous / epidemiology*,  etiology
Case-Control Studies
Microwaves / adverse effects*
Middle Aged
Occupational Exposure / adverse effects*
Odds Ratio
Physical Therapy Modalities*
Radio Waves / adverse effects*
Risk Factors
Grant Support
Comment In:
Am J Epidemiol. 1995 Feb 1;141(3):273-4   [PMID:  7840101 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Radiologic regression of primary sclerosing cholangitis following combination therapy with an endopr...
Next Document:  Exposure-response analysis of cancer mortality in a cohort of workers exposed to ethylene oxide.