Table 5.

Characteristics of patients according to the reflux profiles

	Morning pepsin test				Post-lunch pepsin test				Post-dinner pepsin test
	SE	SP	PPV	NPV	SE	SP	PPV	NPV	SE	SP	PPV	NPV
≥ 16 ng/mL	64.9	66.7	75.0	55.2	59.5	66.7	73.3	51.6	59.0	66.7	74.2	50.0
≥ 36 ng/mL	54.1	80.0	80.0	54.0	56.8	79.2	80.8	54.3	53.9	79.2	80.0	51.4
≥ 45 ng/mL	51.4	83.3	81.8	54.1	54.1	79.2	80.0	52.8	51.3	79.2	80.0	50.0
≥ 75 ng/mL	48.6	83.3	81.0	52.6	45.9	83.3	80.9	50.0	48.7	83.3	82.6	50.0
≥ 100 ng/mL	45.7	87.5	84.2	52.5	45.9	83.3	80.9	50.0	48.7	83.3	82.6	50.0

SE, sensitivity; SP, specificity; PPV, positive predictive value; NPV, negative predictive value