摘要: A RECENT STUDY by the National Center for Health Statistics, Public Service, was concerned with higher and more slowly decreasing perinatal infant mortality in United States compared to six West European countries, one of which Sweden (1). In 1964 U.S. rate highest among seven countries 75 percent than lowest rate, that Sweden. Even when comparison limited white infants States, 52 each studied, decline both retarded after 1950, but slowing down evident all others. According Service study, differences cannot be explained factors such as age mother or birth order child. The data show incidence low-birth-weight is it has been increasing. also suggest weight distribution could account much 85 90 neonatal between hampered, however, insufficient on from lack weight-specific rates later 1950.