Journal of Human Reproductive Science
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ORIGINAL ARTICLE Table of Contents   
Year : 2011  |  Volume : 4  |  Issue : 3  |  Page : 130-137
A meta-analysis of the relationship between endometrial thickness and outcome of in vitro fertilization cycles


1 Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, TX, USA
2 Center for Clinical and Translational Sciences, The University of Texas School of Public Health at Houston, Houston, TX, USA

Correspondence Address:
Mazdak Momeni
29 Church St., Tarrytown, NY 10591
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-1208.92287

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Objective: The objective was to evaluate the relationship between endometrial thickness on the day of human chorionic gonadotropin administration and pregnancy outcome in in vitro fertilization cycles. Design: This was a systematic review and meta-analysis. Materials and Methods: We identified 484 articles using Cochrane library, PubMed, Web of Science, and Embase searches with various key words including endometrial thickness, pregnancy, assisted reproductive technology, endometrial pattern, and in vitro fertilization. A total of 14 studies with data on endometrial thickness and outcome were selected, representing 4922 cycles (2204 pregnant and 2718 nonpregnant). The meta-analysis with a random effects model was performed using comprehensive meta-analysis software. We calculated the standardized mean difference, odds ratio (OR), and 95% confidence intervals (CIs). Results: There was a significant difference in the mean endometrial thickness between pregnant and nonpregnant groups (P<0.001), with a standardized mean difference of 0.4 mm (95% CI 0.22-0.58). The OR for pregnancy was 1.40 (95% CI 1.24-1.58). Conclusions: The mean endometrial thickness was significantly higher in pregnant women compared to nonpregnant. The mean difference between two groups was <1 mm which may not be clinically meaningful. Although there may be a relationship between endometrial thickness and pregnancy, implantation potential is probably more complex than a single ultrasound measurement can determine.


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