Long-term variations of seminal parameters

57 outpatients visited our department for the first time 1975-1978 and a second time four years later (1979-1982). Both semen analyses were compared with respect to the year of the first examination. Significant variations of seminal parameters with increasing age were not found, but sperm count and rate of abnormal sperms was significantly higher in the years 1975-1978 than in 1979-1982 at the second visit. Individual patients showed, despite the fairly constant mean values, marked variations of sperm count from one analysis to the next.