Table 4 Results of the logistic regression analysis of clinical pregnancy and live birth rates after adjustments for confounding factors according to the maternal and cycle characteristics

Female age

0.951

0.934-0.967

<0.001

0.932

0.916-0.948

<0.001

Female BMI

0.997

0.976-1.018

0.761

0.986

0.966-1.006

0.179

Duration of infertility

0.987

0.962-1.014

0.345

0.989

0.963-1.015

0.395

Pattern of infertility

1.005

0.867-1.166

0.944

1.027

0.888-1.187

0.719

Endometrial preparation

0.971

0.919-1.025

0.283

1.016

0.963-1.072

0.553

Thickness of endometrium

1.123

1.075-1.174

<0.001

1.099

1.053-1.146

<0.001

Pattern of insemination

0.880

0.741-1.046

0.148

0.912

0.770-1.079

0.282

Day 3 embryo cell number

1.057

1.030-1.086

<0.001

1.054

1.027-1.081

<0.001

Evenness of the blastomeres of day 3 embryo

0.887

0.757-1.040

0.140

0.890

0.761-1.041

0.144

Fragmentation of day 3 embryo

0.878

0.763-1.011

0.071

0.981

0.853-1.128

0.785

Grade of transferred blastocysts

1.357

1.225-1.503

<0.001

1.381

1.248-1.527

<0.001

Previous transfer cycles

0.914

0.850-0.983

0.015

0.900

0.835-0.969

0.005