| Long agonist protocol group N = 96 | Short antagonist protocol group N = 89 | P* |
E2 on the beginning of COS | 35.1 (18.6) | 36.5 (18.0) | 0.61 |
E2 level on day-5 of COS | 324.9 (273.1) | 363.3 (293) | 0.36 |
E2 level at the day of hCG administration | 2461.8 (2283.7) | 2558.2 (2043) | 0.76 |