Seroprevalence of Helicobacter pylori in school-aged Chinese in Taipei City and relationship between ABO blood groups

Table 1 Age and sex distribution of seroprevalence of anti-bodies against Helicobacter pylori (anti-HP), and comparisons between sex and age groups

Age	Male		Female		P
	Anti-HP (+)/n	(%)	Anti-HP (+)/n	(%)
1-5	0/26	0	1/42	2.4	0.32
6-10	4/39	10.3	2/39	5.1	0.40
11-14	9/53	17.0	3/51	5.9	0.08
Subtotal	13/118	11.0	6/132	4.5	0.06
15	7/34	20.6	11/63	17.5	0.72
16	9/38	23.7	27/90	30	0.46
17	21/65	32.3	24/74	32.4	0.99
18	14/41	34.1	11/20	55.0	0.14
Subtotal	51/179	28.5	73/246	29.7	0.79
Adults	27/49	55.1	19/39	48.7	0.56
Total	91/346	26.3	98/417	23.5	0.37

Table 2 Relationship of ABO blood groups and seropositivity of antibodies against Helicobacter pylori (anti-HP) infection

Blood group	Serum anti-HP (+)	Serum anti-HP (-)	P
O	57 (27.7%)	149 (72.3%)	-
A	32 (31.4%)	70 (68.6%)	0.99
B	28 (30.1%)	65 (69.9%)	0.99
AB	7 (29.2%)	17 (60.8%)	0.99
Total	124 (100%)	301 (100%)