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Table 2 General features of the studies

From: Tobacco smoking and semen quality in infertile males: a systematic review and meta-analysis

Studies Study design Year of patients’ enrollment No of infertile smokers (n) No of infertile non-smokers (n) Age (years) S/NS
Al-Turki2014 Retrospective 2010–2012 90 168 34.2/34.1
Al-Turki2016 Retrospective 2008–2013 194 322 34.6/34.3
Anifandis2014 Prospective 33 98 37.9/37.1
Caserta2012 Cross sectional 2006–2011 200 448 38.3/38.5
Cui2016 Prospective 2013–2015 920 298
Gaur2007 Retrospective 2001–2004 100 100
Meri2013 Retrospective 2010–2011 396 564
Mitra2012 Cross sectional 178 126 40.5/35.0
Trummer2002 Prospective 1993–2000 478 517 31.5/33.4
Mostafa2006 Prospective 20 20
Osser1992 Retrospective 186 164
Yu2013 Cross sectional 2011–2012 147 175 35.6/33.6
Zhang2013 Retrospective 2007–2010 737 775 29.6/29.9
Zhang2015 Retrospective 2013–2014 704 372 29.9/30.4
Dikshit1987 Prospective 1985–1986 219 288 26.7/26.5
Kunzle2003 Retrospective 1991–1997 655 1131 32.3/33.2
Total no of patients (n)    5257 5566  
  1. Abbreviations: S smokers, NS non-smokers