Skip to main content

Table 1 Relationship between PN score and embryo quality parameters

From: Pronuclear score improves prediction of embryo implantation success in ICSI cycles

PN score

1

2

3

N. zygotes (%)

2280 (76 %)

645 (21 %)

79 (3 %)

Patients’ age (mean±SD, years)

35.7 ± 4.4

35.3 ± 4.8

34.4 ± 4.1

Cleavage rate

97 %

96 %

94 %

N. grade 1 embryos (%)

1325/2280 (58 %)

320/645 (52 %)

42/79 (53 %)

N. grade 2 embryos (%)

578/2280 (25 %)

173/645 (27 %)

18/79 (23 %)

N. grade 3 embryos (%)

139/2280 (6 %)

70/645 (11 %)

3/79 (4 %)

N. arrested cleavage-stage embryos (%)

161/2280 (6 %)

55/645 (8 %)

11/79 (14 %)

Blastulation rate

384/1106 (35 %)

114/346 (33 %)

18/38 (47 %)