Table 1.

Databases description. ^*4 unknown.

Feature	dbA	dbB
Objectives (20X, 40X)	(90, 44)	4, 83)
Donated oocytes (%)	16.92%*	12.64%
Mean oocyte age (STD)	34.11 (6.09)	34.93 (4.96)
Embryos expanding	62.69%	78.17%
Embryos hatching	32.83%	17.23%
Embryos hatched	4.48%	4.60%
b-hCG $\ge 20mUI$/$mL$ (%)	52.98%	56.32%
Proportion of fresh oocytes	13.43%	6.89%