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. 2009 Jun 8;4(6):e5836. doi: 10.1371/journal.pone.0005836

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Tests for statistical difference were performed using a two-tailed t-test. Haplogroup U is labeled in red and Haplogroup H is labeled in yellow. Haplogroup H shows significantly increased longevity during 1920–1940.