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. 2016 Feb 17;13(2):224. doi: 10.3390/ijerph13020224

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Comparison of semen quality parameters between tertiles of urinary TCS concentration among Chinese men (471) recruited during November 2013–March 2014. The x-axis refers to tertiles of urinary TCS level corrected by creatinine concentration (TCSCRE): low tertile (<0.66 ng·mg⁻¹), middle tertile (0.66–2.33 ng·mg⁻¹) and high tertile (≥2.33 ng·mg⁻¹); The y-axis refers to sperm quality parameters, including semen volume (a); sperm concentration (b); total sperm count (c); percentage of forward moving (d); percentage of normal sperm (e) and average path velocity (f). The five lines extending vertically along Y-axis from top to bottom are respectively defined to be: Q3 (75%) + 1.5 × inter quartile range (IQR), Q3, median, Q2 (25%), Q2− 1.5 × IQR.