Table 6.

Clinical pregnancy and live birth rates in patients in Group IVF-1 classified into three groups by age at initiation of follow-up.

	Age Groups in Patients in Group IVF-1
	a (<35)	b (35–39)	c (≥40)
Clinical pregnancy rate	31.5% (34/108)**	14.2% (18/127)	1.6% (1/62)
Live birth rate	24.1% (26/108)**	10.2% (13/127)	0.0% (0/62)
Abortion rate	23.5% (8/34)	27.8% (5/18)	100.0% (1/1)

Group IVF-1, patients without possible iatrogenic causes or chromosomal abnormalities in whom ovarian stimulation and IVF-ET were attempted.

a, patients <35 years of age at the initiation of follow-up; b, patients 35–39 years of age at the initiation of follow-up; c, patients ≥40 years of age at the initiation of follow-up.

**p < 0.01.