Table 1.

The Basic Study Characteristics

First author	Publication year	Sample size Female Male	Type of study	Country	Mean age of participants
Arici	2001	338	Retrospective	USA	60
		242
		96
Barczynski	2006	121	Retrospective	Poland	56.1
		106
		15
Berczi	2002	63	Prospective	Hungary	54
		50
		13
Bhansali	2006	46	Prospective	India	37.1
		33
		13
Cakal	2012	39	Prospective	Turkey	53.2
		29
		10
Freudenburg	2006	84	Prospective	Germany	54
		46
		38
D.Hajioff	2004	48	Prospective	UK	60
		36
		12
Lo	2007	100	Prospective	China	55.5
		70
		30
Lumachi	2000	91	Prospective	Italy	59
		65
		26
Patel	2010	63	Retrospective	UK	59
		42
		21
Tubline	2009	144	Prospective	USA	63.2
		117
		27