Table 2.

Changes in the Average Number of Precancerous Lesions

	Baseline			p-value	The last follow-up			p-value
	N	E	P		N	E	P
Mucosal atrophy
Antrum	1.00	1.10	1.24	0.156	1.10	1.46	1.28	0.013 (N vs E) *
Corpus	0.80	1.06	1.15	0.015 (N vs E)*	0.79	1.03	1.29	<0.001 (N vs P)*
				0.009 (N vs P)*				0.029 (E vs P) *
Intestinal metaplasia
Antrum	1.51	1.65	1.61	0.357	1.68	1.78	1.69	0.492
Corpus	1.24	1.38	1.36	0.489	1.16	1.37	1.30	0.242

Data are presented as mean.

Kruskal-Wallis test. Patients with no precancerous lesion were scored as 0; mild, 1; moderate, 2; and marked, 3 based on the updated Sydney system.

N, negative group; E, eradicated group; P, persistent group.

^*Mann-Whitney U test for each pair of groups.