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. 2017 May 24;186(8):918–926. doi: 10.1093/aje/kwx169

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Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health 2017. This work is written by (a) US Government employee(s) and is in the public domain in the US.

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Figure 1. — Variation in semen parameters over time among 12 men who provided 7 or more semen samples in the Environment and Reproductive Health Study, Boston, Massachusetts, 2005–2014. The figure shows variation in total sperm count (A), sperm concentration (B), progressive motility (C), and morphology (D) over time among men who provided 7–9 samples (total number of samples = 92). ID, identification.