Table 2.

The prevalence of positive Helicobacter pylori serology by COPD stage

	COPD (n=201)	Control (n=402)	P-value
H. pylori IgG seropositivity n(%)	92 (45.8)	210 (52.2)	0.134
H. pylori IgG level, units/mL Median (IQR)	114.8 (33.6–191.0)	109.6 (34.3, 166.4)	0.549

Notes:

^*P-value from chi-squared test,

^**P-value from Mann-Whitney test.

Abbreviations: IgG, immunoglobulin G; IQR, interquartile range.