Counting your sperm before they fertilize: are sperm counts really declining?

• 来源期刊: 亚洲男性学杂志（英文版）
• 年，卷（期）: 2013,（2）
• 页码范围: 179-183
• 页数: 5页
• 语种: 英文
• DOI: 10.1038/aja.2012.105

摘要

A purported global decline in sperm counts has been a source of controversy since the early 1990s.Numerous studies performed since then,as well as reanalysis of the original data,show either no changes,or even increases,in sperm concentrations over time.In this review,we discuss the 1992 meta-analysis that initiated the continuing debate on whether sperm concentrations are declining,and the community discussion surrounding it over the past two decades.We also highlight studies evaluating sperm concentrations performed since the initial study that produced different results,and conclude that no definitive cause for a decrease in sperm counts has been established,and the effects of geography and environment on sperm counts are unclear.