Occurrence of down syndrome and human sexual behavior.
We analyzed the sexual habits of 80 mothers of normal children and of 33 mothers of children with the Down syndrome (DS). The data were obtained through the psychological interview technique. Unusually long intervals between intercourse at the time of conception were reported more frequently by mothers of DS children. Independent of the mother's age there was an association between the incidence of DS and long intervals between intercourse.
D003075:Coitus; D004314:Down Syndrome / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D010331:Paternal Age; D012725:Sexual Behavior; D013997:Time Factors