title: Factors determining the rate of disappearance of sperm from the ejaculate after vasectomy.
abstract: The relative importance of age and frequency of coitus in determining the time needed for the semen count to become negative after vasectomy was studied in a group of 831 men. Irrespective of the frequency of coitus, there was a highly significant positive correlation between a patient's age and the time taken to become aspermic. This has implications for general practice: the older patient should be warned that he will take longer than a younger man to become sterile.
mesh_terms: D000328:Adult; D000367:Age Factors; D002452:Cell Count; D003075:Coitus; D006801:Humans; D008297:Male; D008875:Middle Aged; D012661:Semen; D013094:Spermatozoa; D014659:Vasectomy