title: Preterm births: a better comparison statistic.
authors.forename: David
authors.initials: D
authors.lastname: Laflamme
mesh_terms: D005260:Female; D006306:Health Surveys / Q000592:standards; D006801:Humans; D015233:Models, Statistical; D009309:National Center for Health Statistics, U.S.; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology