Table 1.

Characteristics of patients from whom H. pylori was isolated in Mexico during 1997–2017.

Time Period	Total	Mestizo population	Native community
	1997–2017	1997–2017	2002–2004
No of strains	n=167	n=111	n=56
*Age
Age, mean(SD)	50.72 (14.27)	48.7(14.2)	41.63 (20.03)
**Gender
Male, n(%)	48 (28.7)	34 (30.6)	21 (37.5)
Female, n(%)	119 (71.2)	77 (69.4)	35 (62.5)
Diagnosis
Gastritis	119	63	56
Pre-neoplastic	18	18	0
Lesions
Gastric cancer	23	23	0
Duodenal ulcer	7	7	0

*t = - 3.03; p = 0.003.

**X² = 0.795; p = 0.37 OR = 0.74 I. C. 95% = (0.38–1.45).