Shine Rebecca, Peek John, Birdsall Mary
University of Auckland School of Medicine, Auckland, New Zealand.
N Z Med J. 2008 Dec 12;121(1287):50-6.
To investigate whether semen quality has changed in New Zealand over the last 20 years.
A retrospective study from 1987 to 2007. The sperm concentration, volume of seminal fluid, and the percentage of motile sperm were analysed from the first semen sample of 975 men presenting as sperm donors in Auckland and Wellington.
Linear regression showed that the mean concentration of sperm decreased from 110 x 10(6) per millilitre in 1987 to 50 x 10(6) per millilitre in 2007 (p<0.001); an average reduction of 2.5% annually. The volume of semen also fell significantly from 3.7 ml to 3.3 ml (p<0.001). There was no concomitant change in the duration of abstinence.
The decline in semen volume and sperm concentration in men presenting as sperm donors may indicate a reduction in the semen quality of New Zealand men over the past 20 years.
调查过去20年新西兰男性的精液质量是否发生了变化。
一项1987年至2007年的回顾性研究。对奥克兰和惠灵顿975名前来捐献精子的男性的第一份精液样本分析精子浓度、精液量和活动精子百分比。
线性回归显示，精子平均浓度从1987年的每毫升1.1亿降至2007年的每毫升5000万（p<0.001）；平均每年下降2.5%。精液量也显著从3.7毫升降至3.3毫升（p<0.001）。禁欲时间无相应变化。
前来捐献精子的男性精液量和精子浓度下降可能表明过去20年新西兰男性精液质量降低。
