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As maternal age increases, twins and triplets don't experience the same decline in perinatal outcomes as do singletons, according to results of a cross-sectional study
Assisted reproductive technology and other benefits of a higher socioeconomic class may explain the finding, according to Dr. J. Zhang of the National Institute of Child Health and Human Development, Bethesda, Md., and associates (Ferril. Steril. 78[3]:562-68, 2002).
Women of higher socioeconomic status are more likely to use assisted reproductive technology, including transfer of donor eggs from younger women. Their multiple gestations are at lower risk for some complications because they tend to be diplacental, dichorionic, and diamniotic. Assisted reproductive technology is also associated with ...