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Global decline in semen quality: ignoring the developing world introduces selection bias

Authors Deonandan R, Jaleel

Received 8 February 2012

Accepted for publication 27 February 2012

Published 22 March 2012 Volume 2012:5 Pages 303—306

DOI https://doi.org/10.2147/IJGM.S30673

Review by Single-blind

Peer reviewer comments 2


Raywat Deonandan, Marya Jaleel

Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada

Abstract: Multiple studies from around the world have suggested that semen quality is declining globally. However, all studies suffer from variable semen sampling criteria, selection bias with respect to the types of men volunteering to participate, and a bias with respect to a tendency to examine only samples from high-income countries. This heterogeneity in approaches, especially given the undersampling of rural and less affluent men from low-income countries, calls into question researchers' claims of universally declining semen norms.

Keywords: human semen, quality, global, developing world

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