Table 5 Binary logistic regression on blastomere loss/live birth in patients undergoing FET (n = 6287)

Maternal age (years)

0.977 (0.934–1.023)

0.330

Parental age (years)

0.999 (0.962–1.039)

0.979

Maternal BMI (kg/m²)

0.992 (0.959–1.025)

0.627

Duration of infertility (years)

1.014 (0.970–1.060)

0.527

Primary infertility

1.447 (1.038–2.019)

0.029

Pluriparous

1.224 (0.776–1.931)

0.384

Insemination method (ICSI vs. IVF)

1.388 (1.044–1.846)

0.024

Blastomere number at cryopreservation

1.006 (0.871–1.163)

0.933

Live birth

aOR (95% CI)

P

Maternal age (years)

0.901 (0.882–0.921)

< 0.001

Parental age (years)

1.001 (0.983–1.019)

0.956

Maternal BMI (kg/m²)

0.995 (0.983–1.007)

0.376

Duration of infertility (years)

1.009 (0.987–1.032)

0.421

Primary infertility

0.888 (0.769–1.026)

0.108

Pluriparous

0.951 (0.768–1.178)

0.647

Insemination method (ICSI vs. IVF)

0.936 (0.864–1.025)

0.152

Number of blastomere loss

0.655 (0.493–0.869)

0.003

Blastomere number on embryo transfer

1.043 (0.979–1.112)

0.191

Embryo quality (grade 2 vs. grade 1)

0.753 (0.657–0.863)

< 0.001