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Original Article

Is there a seasonal variation in the diagnosis of oligohydramnios?

Michael W Varner Department of Obstetrics and Gynecology, University of Utah, Salt Lake City, UT, USACorrespondence[email protected]

William D Noble Biostatistics Coordinating Center, George Washington University, Washington, DC, USA

Mitchell Dombrowski Department of Obstetrics and Gynecology, Wayne State University, Detroit, MI, USA

Baha Sibai University of Tennessee, Memphis, TN, USA

Dwight J Rouse Center for Research in Women's Health, University of Alabama—Birmingham, Birmingham, AL, USA

Richard Paul University of Southern California, Los Angeles, CA, USA

Steve N Caritis University of Pittsburgh/Magee-Women's Hospital, Pittsburgh, PA, USA

Menachem Miodovnik University of Cincinnati, Cincinnati, OH, USA

Atef Moawad University of Chicago, Chicago, IL, USA

Jay D Iams Ohio State University, Columbus, OH, USA

Frank Witter Johns Hopkins University, Baltimore, MD, USA

Roberto Romero Yale University, New Haven, CT, USA

Kenneth Leveno University of Texas—Southwestern, Dallas, TX, USA

Paul Meis Wake Forest University, Winston-Salem, NC, USA

Ronald Wapner Thomas Jefferson University, Philadelphia, PA USA

Mortimer Rosen Columbia University, New York, NY, USA

Gary Thurnau University of Oklahoma, Oklahoma City, OK, USA

Peter van Dorsten Medical University of South Carolina, Charleston, SC, USA

Mary J O'Sullivan University of Miami, Miami, FL, USA

Deborah Conway University of Texas—San Antonio, San Antonio, TX, USA

for the National Institute of Child Health and Human Development Maternal-Fetal Medicine Units Network Department of Obstetrics and Gynecology, University of Utah, Salt Lake City, UT, USA

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Abstract

Objective. We hypothesized that oligohydramnios would be diagnosed more frequently in the warm summer months when dehydration might be more common.

Methods. The clinical diagnosis of oligohydramnios was extracted from the databases of four completed National Institute of Child Health and Human Development Maternal Fetal Medicine Units Network protocols. These data were stratified by quarter of delivery and compared using Fisher's Exact Test.

Results. The clinical diagnosis of oligohydramnios was made more frequently in deliveries occurring in the summer months of June, July and August as compared with the remainder of the calendar year (7.2% vs 5.9%, p = 0.0178).

Conclusions. In these studies the diagnosis of oligohydramnios is made more frequently in those pregnancies delivered during the summer months. Although not proven by this association, maternal dehydration may contribute to this finding.

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Is there a seasonal variation in the diagnosis of oligohydramnios?

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Is there a seasonal variation in the diagnosis of oligohydramnios?

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