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"Decreasing sperm count has been of great concern since it was first reported twenty-five years ago. Moreover, given the findings from recent studies that reduced sperm count is related to increased morbidity and mortality, the ongoing decline points to serious risks to male fertility and health. First, these data demonstrate that the proportion of men with sperm counts below the threshold for subfertility or infertility is increasing. The findings have important public health implications. Hagai Levine, the lead author and Head of the Environmental Health Track at the Hebrew University-Hadassah Braun School of Public Health and Community Medicine, in the Hebrew University of Jerusalem's Faculty of Medicine. "Given the importance of sperm counts for male fertility and human health, this study is an urgent wake-up call for researchers and health authorities around the world to investigate the causes of the sharp ongoing drop in sperm count, with the goal of prevention," said Dr. However, the current study uses a broader scope and rigorous meta-regression methods, conservatively addresses the reliability of study estimates, and controls for factors that might help explain the decline such as age, abstinence time, and selection of the study population. While declines in sperm count have been reported since 1992, the question has remained controversial because of limitations in past studies. Shanna H Swan, Professor in the Department of Environmental Medicine and Public Health at the Icahn School of Medicine at Mount Sinai, New York, and an international team of researchers from Brazil, Denmark, Israel, Spain and the United States. Hagai Levine, Head of the Environmental Health Track at the Hebrew University-Hadassah Braun School of Public Health and Community Medicine, Jerusalem, with Dr. The study also indicates the rate of decline among Western men is not decreasing: the slope was steep and significant even when analysis was restricted to studies with sample collection between 19. In contrast, no significant decline was seen in South America, Asia and Africa, where far fewer studies have been conducted. The study is published today in Human Reproduction Update, the leading journal in the fields of Reproductive Biology and Obstetrics & Gynecology.īy screening 7,500 studies and conducting a meta-regression analysis on 185 studies between 19, the researchers found a 52.4 percent decline in sperm concentration, and a 59.3 percent decline in total sperm count, among men from North America, Europe, Australia and New Zealand who were not selected based on their fertility status. In the first systematic review and meta-analysis of trends in sperm count, researchers from the Hebrew University-Hadassah Braun School of Public Health and Community Medicine and the Icahn School of Medicine at Mount Sinai report a significant decline in sperm concentration and total sperm count among men from Western countries. view moreĬredit: (Video credit: Hebrew University)
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These findings strongly suggest a significant decline in male reproductive health that has serious implications beyond fertility and reproduction, given recent evidence linking poor semen quality with higher risk of hospitalization and death. Video: A rigorous and comprehensive meta-analysis of data collected between 19 finds that among men from Western countries, sperm concentration declined by more than 50%, with no evidence of a 'leveling off' in recent years.