Table 1.

The positivity of anti-H. pylori antibody in RA patients.

	n	Anti-H. pylori antibody positive, n (%)	P-value
ILD	167	30 (18.0)	.0227
UIP	70	10 (14.3)	.0212
NSIP	97	20 (20.6)	.2259
AD	167	30 (18.0)	.0227
Emphysema	39	8 (20.5)	.4416
CLD(+)	373	68 (18.2)	.0059
CLD(−)	284	78 (27.5)
Total RA	657	146 (22.2)

Abbreviations: AD, airway disease; CLD, chronic lung disease; ILD, interstitial lung disease; NSIP, nonspecific interstitial pneumonia; RA, rheumatoid arthritis; UIP, usual interstitial pneumonia.

ILD group includes UIP and NSIP groups. The CLD(+) group includes UIP, NSIP, AD, and emphysema patients. The positive number in each group is shown. Percentages are shown in parentheses. Differences compared with the CLD(−) population were tested by Fisher’s exact test using 2 × 2 contingency tables.