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(A). The difference of PGI/PGII between CSG and CAG patients is significant (-value 0.023, using student’s t-test). (B). The performance of PGI/PGII in classifying CAG with the logistic regression: the classifier does not have strong discrimination capacity. CSG: Chronic Superficial Gastritis; CAG: Chronic Atrophic Gastritis; PGI: pepsinogen I; PGII: pepsinogen II.
