Table 1. Timing of the kinetic variables from 2769 transferred embryos according to quartiles with LB-KID rates.

Occurrences of P < 0.001 are marked in bold.

			Q1		Q2		Q3		Q4
Variable	No of embryos	Limit (Hours)	LB-KID rate (%)	Limit (Hours)	LB-KID rate (%)	Limit (Hours)	LB-KID rate (%)	Limit (Hours)	LB-KID rate (%)
tPNf	1703	≤ 22.57	25.4***	22.58–24.46	23.2**	24.46–26.46	21.1	≥ 26.47	8.5***
t2	2764	≤ 25.37	24.8***	25.38–27.20	20.6**	27.21–29.42	17.8	≥ 29.43	8.8***
VPN	1700	≤ 2.33	18.8	2.34–2.66	21.2	2.67–3.00	20.5	≥ 3.01	17.9
t3	2542	≤ 36.08	22.6**	36.09–38.40	22.1**	38.41–40.81	20.2	≥ 40.82	12.5***
cc2	2542	≤ 10.67	19.8	10.68–11.51	22.7**	11.52–12.34	20.5	≥ 12.35	12.1***
t4	2428	≤ 36.99	26.2***	34.00–39.33	22.2	39.34–41.66	19.0	≥ 41.67	12.2***
t4—t2	2426	≤ 11.34	23.1**	11.35–12.30	23.3**	12.31–13.18	19.8	≥ 13.19	13.4***
s2	2426	≤ 0.33	23.7***	0.34–0.66	18.8	0.67–1.17	22.1	≥ 1.18	14.9***

*P < 0.05

**P < 0.01

*** P < 0.001. LB-KID: live birth- known implantation data. Variables grouped in quartiles: Q1, Q2, Q3 and Q4.