title: Three-year-old twins and singletons: a comparison of some perinatal, environmental, experiential, and developmental characteristics.
mesh_terms: D001049:Apnea / Q000503:physiopathology; D001724:Birth Weight; D002657:Child Development; D002675:Child, Preschool; D004777:Environment; D005260:Female; D005865:Gestational Age; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D000860:Hypoxia / Q000503:physiopathology; D011247:Pregnancy; D011248:Pregnancy Complications; D014427:Twins