VanderWeele, Tyler J.; Lantos, John D.; Lauderdale, Diane S. - In: Social Science & Medicine 74 (2012) 2, pp. 196-201
Preterm birth rates are higher in the United States than in most industrialized countries, and have been rising steadily. Some attribute these trends to changing demographics, with more older mothers, more infertility, and more multiple births. Others suggest that changes in obstetrics are...
