Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/72317
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Type: Journal article
Title: Does obesity really matter?: the impact of BMI on embryo quality and pregnancy outcomes after IVF in women aged ≤38 years
Other Titles: Does obesity really matter?: the impact of BMI on embryo quality and pregnancy outcomes after IVF in women aged </-38 years
Author: Zander, D.
Henshaw, R.
Hamilton, H.
Lane, M.
Citation: Australian & New Zealand Journal of Obstetrics & Gynaecology, 2012; 52(3):270-276
Publisher: Blackwell Publishing Asia
Issue Date: 2012
ISSN: 0004-8666
1479-828X
Statement of
Responsibility: 
Deirdre L. Zander-Fox, Richard Henshaw, Hamish Hamilton and Michelle Lane
Abstract: BACKGROUND: The increasing prevalence of obesity in women of child-bearing age is of growing concern in the health community. Obesity is associated with sub-optimal reproductive performance; therefore, it is understandable that the number of young women with elevated body mass index (BMI) accessing assisted reproductive treatment (ART) is on the rise. Consequently, this study not only assessed the impact of BMI on fertilisation rates, embryo development and freezing during ART in women aged ≤ 38 years but also determined their subsequent pregnancy and delivery rates. METHODS: Data were retrospectively analysed from all cycles initiated in 2006/2007 for women aged ≤ 38 years. The BMI categorisations were as follows: normal – 18.5–24.9 kg/m2; overweight – 25–29.9 kg/m2; obese – 30–34.9 kg/m2; morbidly obese class I – 35–39.9 kg/m2; morbidly obese class П –_40 kg/m2. RESULTS: Obese and morbidly obese women required a significantly higher follicle stimulating hormone start dose than normal BMI women; however, they obtained significantly fewer oocytes (P < 0.05). Although BMI did not affect embryo development, morbidly obese class Π women had significantly reduced pregnancy rates compared to normal BMI women (30.5 vs 41.7%, respectively; P < 0.05). Furthermore, increasing BMI was positively correlated to increasing rates of preterm delivery (P < 0.05). Increasing BMI was also positively correlated to increasing delivery rates of singleton term macrosomic offspring (_4000 g). CONCLUSION: Obesity in women aged ≤ 38 years does not affect embryo development; however, it does reduce clinical pregnancy rates in women with a BMI_40 and increases rates of preterm labour and delivery of macrosomic offspring.
Keywords: embryo; fetal macrosomia; in vitro fertilisation; maternal body mass index; obstetric outcomes
Rights: © 2012 The Authors ANZJOG © 2012 The Royal Australian and New Zealand College of Obstetricians and Gynaecologists
RMID: 0020120239
DOI: 10.1111/j.1479-828X.2012.01453.x
Appears in Collections:Obstetrics and Gynaecology publications

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