Contingency table analysis for all patients (mITT)
| NGPOD (ITT) | pH aspirate (ITT) | Total; N (%) | |
| pH ≥5.5 or no result | pH ≤5.5 (in stomach) | ||
| Red or no result | 86 | 36 | 122 (24.6) |
| Green | 69 | 305 | 374 (75.4) |
| Total; N (%) | 155 (31.2) | 341 (68.7) | 496 (100) |
Difference between discordant cells: −6.65%, 95% CI −10.66% to −2.65%.
Exact probability (binomial distribution): p=0.0017.
mITT, modified intention to treat; NGPOD, novel fibre-optic pH test device.