Seroepidemiology of Helicobacter pylori infection among asymptomatic Chinese children

Table 1 Prevalence of H. pylori infection of children aged 7-12 years

Age (year)	No. of samples	No. of positive samples	Rate (%)
7	165	51	30.91
8	146	51	34.93
9	167	65	38.92
10	167	77	46.11
11	226	110	48.67
12	167	79	47.30
Total	1119	458	40.93

Table 2 Comparison of community distribution in asymptomatic children with H. pylori infection V

Age (year)	Urban			Rural			P value
	No. of samples	No. of positive samples	%	No. of samples	No. of positive samples	%
7	88	21	23.86	77	30	38.95	0.036
8	69	11	15.94	77	40	51.95	0.001
9	90	33	36.67	77	32	41.56	0.518
10	83	32	38.55	84	45	53.57	0.052
11	92	40	43.48	134	70	52.54	0.195
12	40	9	22.50	127	70	55.12	0.001
13	39	12	30.77
14	42	13	30.95
Total	543	171	31.95	576	287	49.85	0.01

Notice: Children aged 7-11 years are from public schools and of 12-14 years are from private schools.

Table 3 Prevalence of H. pylori of children lived in different families

Group	No. of	No. of positive	Prevalence (%)
samples samples
Peasant	41	18	43.90
Worker (including peasant worker)	580	278	47.93
Intellectual	452	148	32.74a
Other	46	14	30.43a

^aP < 0.005 intellectual and other families vs worker’s and peasant’s families.

Table 4 H. pylori infection rate of children aged 7-14 years in different families

Age	Peasant		Worker		Intellectual		Other
	n	No. of positive (%)	n	No. of positive (%)	n	No. of positive (%)	n	No. of positive (%)
7	9	3 (33.33)	83	29 (34.94)	64	17 (26.56)	9	2 (22.22)
8	8	4 (50.00)	85	39 (45.83)	44	7 (15.91)	9	1 (11.11)
9	6	3 (50.00)	95	42 (44.21)	59	19 (32.20)	7	1 (14.29)
10	6	3 (50.00)	89	46 (46.46)	56	26 (46.43)	6	2 (33.33)
11	6	2 (33.33)	121	62 (51.24)	93	40 (43.01)	6	6 (100.00)
12	6	3 (50.00)	95	59 (62.11)	58	15 (25.86)	8	2 (25.00)
13	0	0 (0.00)	2	1 (50.00)	36	11 (30.56)	1	0 (0.00)
14	0	0 (0.00)	0	0 (0.00)	42	13 (30.95)	0	0 (0.00)