Vierula M, Niemi M, Keiski A, Saaranen M, Saarikoski S, Suominen J
University of Turku, Finland.
Int J Androl. 1996 Feb;19(1):11-7. doi: 10.1111/j.1365-2605.1996.tb00427.x.
Several recent reports have suggested that the sperm counts of normal men are declining in most countries. In this study the sperm counts of Finnish men, and their possible changes during the past 28 years, were investigated. The material consisted of semen samples from 238 normal healthy men of unknown fertility and 5481 men from infertile couples. The means (medians) of semen volume, sperm density and total sperm count in normal men were 3.3 (3.0) ml, 133.9 (94.0) x 10(6)/ml and 396.6 (309.0) x 10(6), respectively. These parameters and the relative frequency distribution of the sperm density were similar to those reported elsewhere in the 1940s. Multiple linear regression analysis revealed a significant decrease in semen volume, whereas sperm density and total sperm count of infertile men had not changed significantly during the past 28 years. In addition, no change in sperm counts was associated with the year of men's birth.
最近的几份报告表明，在大多数国家，正常男性的精子数量正在下降。在这项研究中，对芬兰男性的精子数量及其在过去28年中可能发生的变化进行了调查。研究材料包括来自238名生育能力不明的正常健康男性的精液样本以及来自不育夫妇的5481名男性的精液样本。正常男性精液量、精子密度和总精子数的均值（中位数）分别为3.3（3.0）毫升、133.9（94.0）×10⁶/毫升和396.6（309.0）×10⁶。这些参数以及精子密度的相对频率分布与20世纪40年代其他地方报道的相似。多元线性回归分析显示精液量显著减少，而在过去28年中，不育男性的精子密度和总精子数没有显著变化。此外，精子数量的变化与男性的出生年份无关。
