Table 1 Cut-points, Sensitivities, Specificities and ROC Areas for Pathologic Integrated Esophageal Acidity and Time Esophageal pH < 4.
Period | Integrated Acidity (mmol.hr/L) | Time pH < 4(%) |
|---|---|---|
Cut-point | 8.1 | 4.3 |
24-hour (900–900) |  |  |
Sensitivity (%) | 72 | 89 |
Specificity (%) | 88 | 81 |
ROC Area | 0.86 [0.77,0.94] | 0.90 [0.84, 0.97] |
Postprandial (900–2200) |  |  |
Cut-point | 1.85 | 6.8 |
Sensitivity (%) | 92 | 85 |
Specificity (%) | 62 | 85 |
ROC Area | 0.82 [0.72, 0.91] | 0.88 [0.80, 0.95] |
Nocturnal (2200–900) |  |  |
Cut-point | 1.3 | 2.1 |
Sensitivity (%) | 79 | 81 |
Specificity (%) | 77 | 85 |
ROC Area | 0.79 [0.69, .90] | 0.84 [0.74, .92] |