title: [Statistical studies of prenatal sex ratio].
mesh_terms: D000022:Abortion, Spontaneous / Q000453:epidemiology*; D002869:Chromosome Aberrations / Q000453:epidemiology*; D025063:Chromosome Disorders; D005260:Female; D005313:Fetal Death / Q000453:epidemiology*; D006801:Humans; D011247:Pregnancy; D012737:Sex Factors; D012744:Sex Ratio; D014314:Trisomy
vernacular_title: Considerazioni statistiche sulla sex ratio prenatale.