Editing Preterm birth (section)

====Prenatal care====
The absence of prenatal care has been associated with higher rates of preterm births. Analysis of 15,627,407 live births in the United States in 1995–1998 concluded that the absence of prenatal care carried a 2.9 (95%CI 2.8, 3.0) times higher risk of preterm births.<ref name="sciencedirect1254"/> This same study found statistically significant relative risks of maternal anemia, intrapartum fever, unknown bleeding, renal disease, placental previa, hydramnios, placenta abruption, and pregnancy-induced hypertension with the absence of prenatal care. All these prenatal risks were controlled for other high-risk conditions, maternal age, gravidity, marital status, and maternal education. The absence of prenatal care prior to and during the pregnancy is primarily a function of socioeconomic factors (low family income and education), access to medical consultations (large distance from the place of residence to the healthcare unit and transportation costs), quality of healthcare, and social support.<ref>{{cite journal | vauthors = Rosa CQ, Silveira DS, Costa JS | title = Factors associated with lack of prenatal care in a large municipality | journal = Revista de Saude Publica | volume = 48 | issue = 6 | pages = 977–984 | date = December 2014 | pmid = 26039401 | pmc = 4285828 | doi = 10.1590/S0034-8910.2014048005283 }}</ref> Efforts to decrease rates of preterm birth should aim to increase the deficits posed by the aforementioned barriers and to increase access to prenatal care.