The decreasing trends in fertility rates in many industrialized countries are now so dramatic
that they deserve much more scientific attention. Although social and behavioural factors …

Over the past half-century, the world has witnessed a steep decline in fertility rates in
virtually every country on Earth. This universal decline in fertility is being driven by …

A severe decline in child births has occurred over the past half century, which will lead to
considerable population declines, particularly in industrialized regions. A crucial question is …

During past decades, we have witnessed a remarkable decline in fertility rates (number of
births per 1000 women of reproductive age) in the industrialized world. It seems beyond …

Semen quality appears to have declined in recent decades in some populations, eg north-
western Europe. At the same time, couple fertility may have increased. Hypotheses are …

There exist substantial data to suggest a decline in sperm counts over time. Although
causative factors have yet to be fully elucidated, potential causes include, increased rates of …

Recent reports have suggested that the incidence of genitourinary abnormalities in human
males has increased during the past 50 years, including congenital abnormalities such as …

It is predicted that Japan and European Union will soon experience appreciable decreases
in their populations due to persistently low total fertility rates (TFR) below replacement level …

A revolution in reproductive behavior has swept the globe since the 1960s. In the
developing countries of Asia, Africa, and Latin America, contraceptive use, once rare, is now …

Healthy men produce an enormous number of sperms, far more than necessary for
conception. However, several studies suggest that semen samples where the concentration …