HP and infection: Group differences were assessed, and receiver operating characteristic (ROC) curve analysis was used to assess the diagnostic performance of PG alone and in combination with Hp-IgG, age, and sex for GC and EGC.<h4>Results</h4>Significant differences were observed among the four groups in PGI, PGII, PGR, <i>Hp</i> infection rate, age, and sex (<i>p</i> < 0.01).