The extent and antecedents of uncertain gestation.
The extent and genesis of uncertainty of gestation has been studied in a total obstetric population, using in all cases a best clinical estimate of gestation made according to a specific protocol. In 73.2% of patients, the estimate was assessed as certain, in 19.7% as approximate, and in 7.1% as uncertain. Uncertainty assessed in this way has several antecedents, and coding of only of these (presence or absence of a precise date for the last menstrual period) is insufficient in data to be used for research in which gestation length is to be used as a variable.
D000293:Adolescent; D000328:Adult; D003276:Contraceptives, Oral; D004493:Education; D005260:Female; D005865:Gestational Age; D006801:Humans; D007086:Illegitimacy; D007226:Infant Mortality; D007231:Infant, Newborn; D008423:Maternal Age; D008599:Menstruation Disturbances; D010298:Parity; D011247:Pregnancy; D012907:Smoking; D012923:Social Class
D003276:Contraceptives, Oral