LogFAQs > #969479995

"While sperm count is an imperfect proxy for fertility, SC and TSC are closely linked to fertility chances (Guzick et al., 2001). The relationship between SC and time to conception is nonlinear. Thus, past a threshold of 4050 million/ml, a higher SC does not necessarily imply a higher probability of conception. On the other hand, below that threshold, the probability of conception drops off rapidly as SC declines (Bonde et al., 1998). On a population level, the drop in mean SC from 104 to 49 million/ml that we report here implies a substantial increase in the proportion of men with delayed time to conception. Thus, SC provides the most stable and reliable measurement for comparisons within and among populations and over time."

So, a ~50% decrease since the 1970s (~1% per year) and 49 million/ml is at the upper limit of the threshold of not mattering, which means we have a good 10 years before this is an issue? Plenty of time to fix it!