title: An epidemiological study of timing failure type pregnancies.
mesh_terms: D000328:Adult; D001741:Black or African American; D004522:Educational Status; D004812:Epidemiologic Methods; D005193:Family Planning Services; D005260:Female; D006801:Humans; D008423:Maternal Age; D009657:North Carolina; D010298:Parity; D011247:Pregnancy; D011275:Pregnancy, Unwanted; D012111:Residence Characteristics; D012959:Socioeconomic Factors; D013997:Time Factors