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. 1999 May;44(5):693–697. doi: 10.1136/gut.44.5.693

Figure 2 .

Figure 2

Receiver operator characteristics (ROC) curves generated with serum pepsinogen (PG) I concentrations alone, PG II concentrations alone, and I:II ratios alone (A), various serum PG I concentrations or I:II ratios (B), the combination of various serum PG I concentrations and I:II ratios (C), and by changing the serum PG I concentration from 30 to 80 ng/ml, the PG II concentration from 5 to 30 ng/ml, and the I:II ratio from 2.0 to 4.0 intermittently. The following cut off points are found to be suitable: a I:II ratio of less than 3.0 alone (A), a PG I concentration of less than 30 ng/ml or a I:II ratio of less than 3.0 (B), a PG I concentration of less than 70 ng/ml and a I:II ratio of less than 3.0 (C).