Table 1.

The male/female ratio in the prevalence of erosive esophagitis and non-erosive esophagitis

	Ref.	Country	Number		Study period	Male/female ratio
			Men	Women
Erosive reflux esophagitis
United States	El-Serag et al[13], 2002	United States	4092	2617	NA	1.6
	Lin et al[14], 2004	United States	131	63	NA	1.6
Europe	Nilsson et al[15], 2002	Sweden	108	71	1996-1997	1.6
	Jaspersen et al[16], 2003	German/Austria /Switzerland	1966	1279	2000-2001	1.6
	Ford et al[17], 2005	United Kingdom	1695	1301	2001-2003	1.4
	Menon et al[18], 2011	United Kingdom	13148	11092	1997-2009	1.2
Asia	Furukawa et al[19], 1999	Japan	533	444	1996-1998	1.3
	Koike et al[20], 1999	Japan	98	78	1995-1998	1.3
	Ho et al[21], 2005	Singapore	649	479	1992-2001	1.4
Non-erosive reflux esophagitis
United States	Richter et al[24], 2000	United States	375	523	NA	0.8
Europe	Damiano et al[25], 2003	United States	73	150	NA	0.5
	Jaspersen et al[16], 2003	German/Austria /Switzerland	1337	1633	2000-2001	0.9
	Ronkainen et al[12], 2005	Sweden	340	431	NA	0.8

NA: Non-applicable (data not available).