Table 1.Morphokinetic parameters (mean ± standard deviation) obtained from the time-lapse monitoring system of blastocyst culture, according to embryo classification groups
	Classification of degree of expansion, MCI and trophectoderm
Morphokinetic parameters	Excellent	Good	Average	Poor
CPap (h)	2.99±0.74a	3.48±1.34b	3.40±1.36b	3.55±1.93b
PNap (h)	8.20±2.42	8.66±1.62	8.89±2.10	9.17±2.65
PNbd (h)	21.80±2.58a	22.96±3.03b	23.21±2.92b	23.47±3.70b
T2 (h)	24.38±2.54a	25.57±3.48b	25.53±3.11b	25.78±3.96b
T3 (h)	34.40±3.98	34.30±4.86	35.90±4.83	35.24±5.65
Cc2 (h)	9.46±4.79	9.91±3.67	10.10±4.01	9.50±4.55
T4 (h)	37.49±5.23	37.97±6.02	37.92±4.30	37.95±5.63
S2 (h)	1.97±3.33a	2.70±3.43a	2.09±3.58a	3.67±4.86b
T5 (h)	46.09±7.51	46.66±5.99	47.96±7.20	46.74±7.84
Cc3 (h)	11.69±5.57	11.36±1.87	11.14±9.31	11.49±5.01
TB (h)	104.04±8.53a	104.10±10.72a,b	107.27±8.73b	106.86±8.44b
Appearance of the second polar corpuscle (CPap); appearance of the pronuclei (PNap); disappearance of pronuclei (PNbd); end of the division into two cells (T2); end of the division into three cells (T3); duration of the second cell cycle (Cc2/T3-T2); end of the division into four cells (T4); synchronization of the division of three to four cells (S2/T4-T3); end of the division to five cells (T5); time between the division of three cells and five cells (Cc3/T5-T3); when the blastocyst began to expand (TB). a,bValues within rows the diferente superscripted letter are significantly different.