Contingency table analysis for mITT subgroup undergoing repeat testing
| NGPOD (ITT) | pH aspirate (ITT) | Total; N (%) | |
| pH ≥5.5 or no result | pH ≤5.5 (in stomach) | ||
| Red or no result | 80 | 35 | 115 (28.7) |
| Green | 57 | 228 | 285 (71.2) |
| Total; N (%) | 137 (34.2) | 263 (65.8) | 400 (100) |
Difference between discordant cells: −5.50%, 95% CI −10.17% to −0.83%.
Exact probability (binomial distribution): p=0.0280.
mITT, modified intention to treat; NGPOD, novel fibre-optic pH test device.