Table 1.

Basic characteristics of all studies.

Study (author, year)	Race/Country	Definition of FD	FD			Control
			n	Age (Mean±SD)	Male (%)	n	Age (Mean±SD)	Male (%)
Park et al., 2012	Koreas	Rome III	102	11.2±3.6	31.3	148	10.8±3.9	54.7
Kim et al., 2012	Koreas	Rome III	167	49±15	37.1	434	47±15	38.5
Shimpuku et al., 2011	Japanese	Rome III	74	59.2±14.2	48.6	64	37.2±9.13	89.1
Oshima et al., 2010	Japanese	Rome III	68	43(23–69)*	36.8	761	45(19–83)*	42.7
Van-Lelyveld et al., 2008	Netherlands/Caucasian	Rome II	112	42.3±1	28	336	41.9±1	28
Tahara et al., 2008	Japanese	Rome II	89	60.1±13.1	73	94	61.1±13.1	69
Camilleri et al., 2006	USA	Rome II	50	55(34–79)*	54	39	60(37–81)*	44
Holtmann et al., 2004	Germany/Caucasian	Rome II	56	46.4±1.9	35.7	112	44.4±1.3	35.7

FD: functional dyspepsia; SD: standard deviation.

^*Range of age.