Table 5 Logistic regression analysis of the low number of frozen blastocysts (≤ 1)

Infertility

  Secondary

0.768

0.621, 0.949

0.015

  Primary

REF

Dose/Duration of Gn

1.003

< 0.001

Number of oocytes retrieved

0.832

0.806, 0.858

< 0.001

Fertilisation

  ICSI

1.464

1.175, 1.826

0.001

  IVF

REF

DFP

  Group A

REF

  Group B

1.312

1.014, 1.698

0.039

  Group C

1.417

1.014, 1.979

0.041