Parameter | Synchronized | Unsynchronized | Mixed | Group comparison | Association with pregnancy |
Mean embryo grading at cryopreservation | 2.1 ± 0.2 | 2.1 ± 0.2 | 2.1 ± 0.2 | P < 0.0001 a (S vs U) P < 0.002 (S vs M) P < 0.002 (U vs M) NS | NS |
Mean embryo grading at thawing | 2.1 ± 0.3 | 2.0 ± 0.3 | 2.0 ± 0.3 | P < 0.004 b (S vs U) P < 0.001 (S vs M) P < 0.021 (U vs M) NS | P < 0.056 Preg + (2.15 ± 0.26) vs No preg (2.07 ± 0.3) |
Maximal embryo grading at cryopreservation | 2.3 ± 0.2 | 2.2 ± 0.2 | 2.3 ± 0.2 | P < 0.037 c (S vs U) P < 0.012 (S vs M) NS (U vs M) P < 0.05 | NS |
Maximal embryo grading at thawing | 2.2 ± 0.3 | 2.1 ± 0.3 | 2.2 ± 0.3 | P < 0.03 d (S vs U) P < 0.008 (S vs M) NS (U vs M) P < 0.07 | P < 0.023 Preg + (2.30 ± 0.26) vs No preg (2.2 ± 0.33) |