OLGA stage of the 211 patients with autoimmune gastritis at the index endoscopy (T1) and at the last (T2) endoscopy/biopsy check-up (p<0.00001)
| OLGA stage At T1 | OLGA stage at T2 | |||||
| Stage 0 | Stage I | Stage II | Stage III | Stage IV | Total | |
| Stage 0 | 3 | 5 | 0 | 0 | 0 | 8 |
| Stage I | 1 | 11 | 9 | 2 | 0 | 23 |
| Stage II | 3 | 3 | 165 | 8 | 0 | 179 |
| Stage III | 0 | 0 | 1 | 0 | 0 | 1 |
| Stage IV | 0 | 0 | 0 | 0 | 0 | 0 |
| Total | 7 | 19 | 175 | 10 | 0 | 211 |
The cells highlighted in grey shows cases that did not undergo any histological changes between T1 and T2. Cells in the space above and to the right of the grey cells show cases that worsened, whereas cells below and to the left of the grey cells show cases that underwent an improvement.