Table 2 Pronuclear morphology in zygotes related to the maternal age.

≤32

33-37

38-41

O.R. (C.I. 95%)

≤32

33-37

38-41

O.R. (C.I. 95%)

A

172 (72.0)

330 (69.8)

281 (79.4)

0.667 (0.456-0.976)*

0.600

(0.434-0.828)°

125 (69.1)

275 (67.9)

195 (81.2)

0.511

(0.328-0.808)*

0.484

(0.330-0.711)°

B

55 (23.0)

123 (26.0)

53 (15.0)

1.698

(1.118-2.578)*

1.996

(1.398-2.849)°

44 (24.3)

116 (28.3)

34 (14.2)

2.099

(1.278-3.448)*

2.424

(1.592-3.687)°

C

9 (3.8)

11 (2.3)

11 (3.1)

n.s.

9 (5.0)

9 (2.2)

8 (3.4)

n.s.

D

3 (1.3)

9 (1.9)

9 (2.5)

n.s.

3 (1.6)

6 (1.5)

3 (1.2)

n.s.

E

0 (0.0)

0 (0.0)

0 (0.0)

n.s.

0 (0.0)

0 (0.0)

0 (0.0)

n.s.

All zygotes

239

473

354

181

406

240