| Study | Sample size | Semen volume (mL) | Sperm concentration (106/mL) | Total count (106) | | High | Low | High | Low | High | Low | High | Low | Selevan, 2000 | 47 | 162 | | | | | | | De Rosa, 2003 | 85 | 85 | | | | | NM | NM | Rubes, 2005 | 36 | 36 | | | | | | | Guven, 2008 | 38 | 35 | | | | | NM | NM | Boggia, 2009 | 100 | 64 | NM | NM | | | NM | NM | Rubes, 2010 | 47 | 47 | | | | | NM | NM | Calogero, 2011 | 36 | 32 | NM | NM | | | | | Zhou, 2014 | 429 | 917 | | | | | NM | NM | Wu, 2016 | 367 | 349 | NM | NM | | | | | Liu, 2017 | 370 | 327 | NM | NM | | | | | Lao, 2018 | 535 | 501 | NM | NM | | | NM | NM |
| Study | Progressive motility (PR, %) | Total motility (, %) | Normal morphology (%) | SCSA-DFI (%) | High | Low | High | Low | High | Low | High | Low | Selevan, 2000 | | | | | | | | | De Rosa, 2003 | | | | | NM | NM | NM | NM | Rubes, 2005 | NM | NM | | | | | | | Guven, 2008 | | | NM | NM | NM | NM | NM | NM | Boggia, 2009 | | | | | NM | NM | NM | NM | Rubes, 2010 | | | | | | | | | Calogero, 2011 | | | | | | | | | Zhou, 2014 | | | | | | | NM | NM | Wu, 2016 | | | | | NM | NM | NM | NM | Liu, 2017 | | | | | NM | NM | NM | NM | Lao, 2018 | | | | | | | NM | NM |
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