Table 1: The OLGA staging system. Stage is scored in following way: 1) Scoring atrophy at each single antral/angular biopsy level (row) and corpus biopsy level (column); 2) Calculating mean of degree of atrophy in antral/angular level (A) and corpus level (C); 3) The final prevalence of atrophy at each compartment is calculated and scored on a four-tiered scale (no atrophy = 0%: score = 0, mild atrophy = 1-30%: score = 1, moderate atrophy = 31-60%: score = 2, severe atrophy => 60%: score = 3) [7].
C0 | C1 | C2 | C3 | |
A0 | Stage 0 | Stage I | Stage II | Stage III |
A1 | Stage I | Stage I | Stage II | Stage III |
A2 | Stage II | Stage II | Stage II | Stage IV |
A3 | Stage III | Stage III | Stage IV | Stage IV |