Helicobacter pylori infection in subjects negative for high titer serum antibody

Table 2 Area under the receiver operating characteristic curve for predicting Helicobacter pylori infection

	AUC	95%CI	P value
Age	0.684	0.564-0.804	0.0027
Body mass index	0.646	0.518-0.774	0.026
Serum antibody titer	0.631	0.500-0.763	0.051
Kyoto classification of gastritis	0.886	0.803-0.968	3.7 × 10-20
Endoscopic atrophy	0.848	0.760-0.936	7.7 × 10-15
Endoscopic intestinal metaplasia	0.674	0.570-0.777	0.0010
Enlarged fold	0.583	0.503-0.662	0.042
Nodularity	0.543	0.485-0.602	0.15
Redness	0.730	0.623-0.837	2.4 × 10-5
Gastric sticky mucus	0.612	0.508-0.716	0.035
Fundic gland polyp	0.655	0.594-0.717	7.4 × 10-7
H. pylori density	0.891	0.805-0.977	5.6 × 10-19
Chronic inflammation	0.846	0.776-0.916	5.3 × 10-22
Neutrophil activity	0.826	0.727-0.926	1.3 × 10-10

Positive urea breath test was defined as H. pylori infection. The values of the AUC were compared with the value of 0.5 using the chi-square test. AUC: Area under the receiver operating characteristics curve; CI: Confidence interval; H. pylori: Helicobacter pylori.