OBJECTIVE: To compare the risk of preterm delivery, low birth weight, and admission of the newborn to a neonatal intensive care unit (NICU) in women pregnant after fertility treatment and subfertile women with the risk in fertile women. DESIGN: Prospective follow-up study. SETTING: Aarhus University Hospital, Skejby, Denmark, 1989-2006. PATIENT(S): A total of 20,080 liveborn singletons. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Preterm delivery, low birth weight, and admission of the newborn to a NICU. RESULT(S): After adjustment we found a statistically significantly increased risk of preterm delivery and very preterm delivery in women who conceived after in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) compared with fertile women. Compared with fertile women, the risk of preterm delivery and very preterm delivery was not statistically significantly different in women pregnant after non-IVF assisted reproductive treatment (non-IVF ART) or subfertile women. We found no association between IVF/ICSI and the risk of low birth weight at term or admittance to the NICU. CONCLUSION(S): The increased risk of preterm delivery after IVF/ICSI may be due to the fertility treatment or unknown characteristics in the couples who undergo IVF/ICSI.
OBJECTIVE: To compare the risk of preterm delivery, low birth weight, and admission of the newborn to a neonatal intensive care unit (NICU) in women pregnant after fertility treatment and subfertile women with the risk in fertile women. DESIGN: Prospective follow-up study. SETTING: Aarhus University Hospital, Skejby, Denmark, 1989-2006. PATIENT(S): A total of 20,080 liveborn singletons. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Preterm delivery, low birth weight, and admission of the newborn to a NICU. RESULT(S): After adjustment we found a statistically significantly increased risk of preterm delivery and very preterm delivery in women who conceived after in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) compared with fertile women. Compared with fertile women, the risk of preterm delivery and very preterm delivery was not statistically significantly different in women pregnant after non-IVF assisted reproductive treatment (non-IVF ART) or subfertile women. We found no association between IVF/ICSI and the risk of low birth weight at term or admittance to the NICU. CONCLUSION(S): The increased risk of preterm delivery after IVF/ICSI may be due to the fertility treatment or unknown characteristics in the couples who undergo IVF/ICSI.
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