title: The changing relationship between socioeconomic status and infant mortality: an analysis of state characteristics.
mesh_terms: D001741:Black or African American; D004493:Education; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D011247:Pregnancy; D012189:Retrospective Studies; D012923:Social Class; D014481:United States