Abstract
enough data have been presented to indicate that there has not been a substantial change in the numerical aspect of semen quality. Saidi et al. (4), in a recently published review of 29 U.S. studies from the late 1930s to the late 1990s, found no signifi? cant changes in sperm counts during the last 60 years. MacLeod and Wang (3) reviewed all of the U.S. data available up to that time (1979), including data from fertile men as well as from men evaluated at a fertility center. The earliest data on sperm counts in New York City, published in 1938 (5), were on prenatal couples (i.e., men of known fertility); mean counts (137 X 106/mL) from this study are virtually identical to the mean counts (131.5 X 106/mL) reported in the most recent study from New York City published in 1996 (6), which focused on donors to sperm banks (i.e., men of unknown fertility).
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