title: Screening for Down's syndrome. Modelling does not predict reality accurately.
authors.forename: David
authors.initials: D
authors.lastname: Howe
mesh_terms: D000328:Adult; D004314:Down Syndrome / Q000175:diagnosis*; D019317:Evidence-Based Medicine; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis; D006801:Humans; D008403:Mass Screening / Q000379:methods*; D008962:Models, Theoretical; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*