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To what extent does medically assisted reproduction (MAR; ovulation induction, artificial insemination, in vitro fertilization, and intracytoplasmic sperm injection) itself affect pregnancy outcomes? Investigators used an administrative database in Finland to identify a random sample of 20% of households with children born between 1995 and 2000. Among some 65,000 children, 2776 were conceived with MAR.
Between-family analysis showed that, compared with natural conception, MAR was associated with significantly higher rates of preterm birth (5% vs. 15%) and low birth weight (3% vs. 13%). After controlling for the child's sex, multiple birth status, birth order, maternal age at birth, smoking during pregnancy, and income, these differences pers…