Jennifer F. Kawwass

BackgroundWhile extreme ambient heat has been associated with several adverse pregnancy and birth outcomes little is known regarding the link between extreme ambient temperatures and human fertility.ObjectiveTo evaluate the associations bet…

PurposeThe majority of data regarding oocyte cryopreservation (OC) outcomes focuses on healthy women. We compare trends, cycle characteristics, and outcomes between women freezing oocytes for fertility preservation due to cancer versus elec…

Study questionIs the use of donor oocytes in women <35 years of age associated with an increased risk of adverse perinatal outcomes compared to use of autologous oocytes?Summary answerAmong fresh assisted reproductive technology (ART) cycle…

BackgroundInformation regarding the use of donor sperm in assisted reproductive technology, as well as subsequent treatment and perinatal outcomes, remains limited. Outcome data would aid patient counseling and clinical decision making.Obje…

PurposeTo compare national trends and perinatal outcomes following the use of ejaculated versus surgically acquired sperm among IVF cycles with male factor infertility.MethodsThis retrospective cohort includes US fertility clinics reporting…

ObjectiveTo compare characteristics, explore predictors, and compare assisted reproductive technology (ART) cycle, transfer, and pregnancy outcomes of autologous and donor cryopreserved oocyte cycles with fresh oocyte cycles.DesignRetrospec…

PurposeThe purpose of the study was to describe trends in and investigate variables associated with clinical pregnancy and live birth in autologous in vitro fertilization (IVF) cycles among women ≥40 years.MethodsWe used autologous IVF cycl…

ObjectiveTo examine outcomes of singleton pregnancies conceived without assisted reproductive technology (non-ART) compared with singletons conceived with ART by elective single-embryo transfer (eSET), nonelective single-embryo transfer (no…

ObjectiveTo investigate the associations among underweight body mass index (BMI), pregnancy, and obstetric outcomes among women using assisted reproductive technology (ART).DesignRetrospective cohort study using national data and log binomi…

ObjectiveTo characterize risks for early pregnancy loss after fresh and frozen IVF cycles and to investigate whether risk is modified by infertility diagnoses or transfer of embryos in fresh versus frozen cycles.DesignRetrospective cohort s…

ObjectiveTo assess endometriosis-associated infertility trends among assisted reproductive technology (ART) cycles, and to compare cancellation and hyperstimulation risks and pregnancy and live birth rates among women using ART for endometr…

ObjectiveTo evaluate trends of monozygotic twinning after single embryo transfer and its association with patient and treatment factors.MethodsOur retrospective cohort study included 28,596 pregnancies after fresh, nondonor single embryo tr…

ImportanceIntracytoplasmic sperm injection (ICSI) is increasingly used in patients without severe male factor infertility without clear evidence of a benefit over conventional in vitro fertilization (IVF).ObjectiveTo assess national trends …

ObjectiveTo assess trends and outcomes of assisted hatching among assisted reproductive technology (ART) cycles.DesignRetrospective cohort analysis using National ART Surveillance System (NASS) data.SettingU.S. fertility centers reporting t…