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Table 1 Clinical parameters of open and closed vitrification
| Open vitrification | Closed vitrification | P value | |
|---|---|---|---|
| (106 cycles) | (226 cycles) | ||
| Patient age at transfer (years) | 33.1 ± 4.4 | 32.5 ± 4.1 | 0.171 |
| BMI (kg/m 2 ) | 23.38 ± 3.3 | 24.19 ± 4.6 | 0.105 |
| No. of primary infertility | 68 (64.2) | 139 (61.5) | 0.643 |
| Reason for infertility | |||
| Female factor | 59 (55.7) | 114 (50.4) | 0.375 |
| Male factor | 18 (17.0) | 46 (20.4) | 0.468 |
| Others | 29 (27.4) | 66 (29.2) | 0.729 |
| Method of fertilization | |||
| IVF | 64/106 (60.4) | 136/226 (60.2) | 0.972 |
| ICSI | 40/106 (37.7) | 86/226 (38.1) | 0.956 |
| Half ICSI | 2/106 (1.9) | 4/226 (1.7) | 0.941 |
| Mean number of embryos transferred | 1.39 ± 0.52 | 1.31 ± 0.53 | 0.193 |
