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. 2012 Jul 2;2(4):e000990. doi: 10.1136/bmjopen-2012-000990

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© 2012, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode.

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Semen parameters of Danish men from the general population. Red bars show 25th–75th percentiles with median line. Whiskers show 5th–95th percentiles. The sperm concentration (A) and total sperm count (B) increased slightly by year of examination. Percentage of morphologically normal spermatozoa did not show any temporal trend (C).