Association of Helicobacter pylori babA2 with peptic ulcer disease and gastric cancer

Table 1 Characteristics of studies included in the meta-analysis n (%)

Ref.	Population	Gastritis or NUD	PUD	GU	DU	GC
		babA2+	babA2+	babA2+	babA2+	babA2+
Asian
Saxena et al[36]	India	35 (26.32)	19 (52.78)			10 (28.57)
Talebi Bezmin Abadi et al[9]	Iran	17 (26.15)	10 (18.18)		10 (18.18)	38 (95.00)
Safaei et al[17]	Iran	30 (68.18)	20 (74.07)		20 (74.07)	8 (80.00)
Oleastro et al[19]	Japan	28 (100.00)	42 (100.00)
Oleastro et al[19]	South Korea	37 (100.00)	28 (100.00)
Chomvarin et al[24]	Thai	57 (91.94)	31 (91.18)	17 (85.00)	14 (100.00)	15 (93.75)
Erzin et al[23]	Turkey	7 (23.33)	14 (46.67)		14 (46.67)	29 (87.88)
Zhang et al[22]	China	89 (66.92)	89 (60.14)	28 (59.57)	61 (60.40)	54 (68.35)
Sheu et al[26]	Taiwan	85 (100.00)	60 (100.00)	30 (100.00)	30 (100.00)
Zheng et al[25]	China	11 (37.93)	17 (39.53)
Han et al[29]	China	28 (65.12)	50 (64.94)	15 (50.00)	35 (74.47)	12 (57.14)
Lai et al[34]	Taiwan	41 (100.00)	46 (100.00)	15 (100.00)	31 (100.00)	14 (100.00)
Maeda et al[33]	Japan	52 (96.30)	40 (95.24)	20 (100.00)	20 (90.91)	11 (100.00)
Yamaoka et al[32]	Korea	47 (88.68)	111 (96.52)		111 (96.52)
Yamaoka et al[32]	Japan	112 (88.89)	172 (95.56)		112 (88.89)
Mizushima et al[35]	Japan	34 (80.95)	73 (84.88)	38 (84.44)	35 (85.37)	36 (90.00)
Western
Mattar et al[16]	Brazil	22 (64.71)				14 (41.18)
Oleastro et al[18]	Portugal	7 (11.67)	27 (47.37)
Bartchewsky et al[21]	Brazil	102 (79.07)				40 (78.43)
Oleastro et al[19]	Portugal	16 (32.00)	25 (50.00)
Oleastro et al[19]	France	3 (50.00)	22 (81.48)
Oleastro et al[19]	Sweden	4 (40.00)	10 (83.33)
Oleastro et al[19]	Germany	6 (60.00)	7 (77.78)
Oleastro et al[19]	United States	12 (92.31)	10 (100.00)
Oleastro et al[19]	Brazil	12 (100.00)	10 (100.00)
Oleastro et al[20]	Portugal	18 (32.14)	25 (50.00)
Gatti et al[27]	Brazil	16 (43.24)	20 (40.00)	11 (37.93)	9 (42.86)
Gatti et al[28]	Brazil	37 (54.41)	3 (20.00)
Olfat et al[10]	Finland	12 (46.15)	22 (70.97)
Olfat et al[10]	Portugal	12 (19.67)	19 (63.33)
Olfat et al[10]	Germany	19 (28.36)	22 (88.00)
Oliveira et al[31]	Brazil	24 (31.58)	43 (53.75)		43 (53.75)	29 (55.77)
Zambon et al[30]	Italy	26 (27.96)	20 (48.78)
Yamaoka et al[32]	Colombia	28 (70.00)	34 (85.00)		34 (85.00)	34 (82.93)
Yamaoka et al[32]	United States	28 (70.00)	35 (85.37)		35 (85.37)	19 (63.33)
Yamaoka et al[11]	United States	66 (71.74)	123 (84.83)		123 (84.83)
Yamaoka et al[11]	Colombia	37 (71.15)	53 (82.81)		53 (82.81)
Gerhard et al[8]	Munich	13 (37.14)	23 (100.00)		23 (100.00)	21 (77.78)

NUD: Nonulcer disease; PUD: Peptic ulcer disease; GU: Gastric ulcer; DU: Duodenal ulcer; GC: Gastric cancer.