title: Factors associated with spontaneous pre-term birth.
abstract: Factors associated with spontaneous pre-term birth in 283 singleton pregnancies were compared with those present in a total population of 16 994 women at risk studied in the First British Perinatal Mortality Survey. It was shown that the risk of spontaneous pre-term birth was related to low maternal age, low maternal weight, maternal smoking, low social class, illegitimacy, threatened abortion, and a previous history of antepartum haemorrhage, perinatal loss, or low birth weight livebirths.
mesh_terms: D001724:Birth Weight; D001827:Body Height; D001835:Body Weight; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008423:Maternal Age; D007752:Obstetric Labor, Premature / Q000209:etiology*; D011247:Pregnancy; D011250:Pregnancy Complications, Hematologic; D012907:Smoking; D012923:Social Class; D014592:Uterine Hemorrhage / Q000150:complications