Table 5.

Infertility around the world ^a , [12] reported from previous studies examining male infertility to summarize previous research

	Population	Author, year	Female factor	Male factor	Combination
French Regions (1988-1989)	1686 Couples	Thonneau et al. 1991 [13]	30%	20%	39%
Western Siberia	2000 Married women; 186 couples	Philippov et al. 1998 [27]	52.70%	6.40%	38.70%
Southeastern Nigeria	314 couples	Ikechebelu et al. 2003 [19]	25.80%	42.40%	20.70%
Mongolia	430 Couples	Bayasgalan et al. 2004 [28]	45.80%	25.60%	18.80%
Poland/Eastern Europe	Unreported	Sanocka and Kurpisz 2003 [14]; Bablok et al. 2011 [6]	Unreported	40-60%b [14]; 56% [6]	Unreported
Egypt	190 Women	Inhorn, Buss 1994 [7]	82%	13%c; 46%d [7]	Unreported
Yazd Province of Iran	5200 Couples	Aflatoonian et al. 2009 [8]	57.5%	25.3% [8]	8%
Sudan	710 couples	Elussein et al. 2008 [9]	49.3%	36.2% [9]	Unreported

^aTable has been adapted from Winters and Walsh [12].

^bThis number was from Sanocka et al., which stated that 20% of couples are infertile, and 40-60% of those cases are due to male factor infertility [6]. This calculation amounts to 8-12% of men overall are the reason for these infertility cases.

^cIn Inhorn and Buss, in 11/87 (13%) of evaluated cases, male factor infertility was the sole cause of infertility [13].

^dIn Inhorn and Buss, in 40/87 (46%) of cases, male factor was involved [13].