Table 3 Univariate and multivariate analysis of predictor variables for HDP

  ≤ 8

1.958 (1.367–2.805)

< 0.001^a

1.853 (1.281–2.679)

0.001^a

  > 8–12

1

1

  > 12

0.984 (0.765–1.265)

0.898

1.000 (0.775–1.291)

0.999

 First

1

1

 High order

1.007 (0.783–1.295)

0.955

0.774 (0.550–1.088)

0.141

 IVF

1

1

 ICSI

0.923 (0.725–1.174)

0.514

0.961 (0.751–1.229)

0.751

 GnRH antagonist protocol

1

1

 GnRH agonist long protocol

1.004 (0.740–1.362)

0.981

1.071 (0.784–1.463)

0.667

 GnRH agonist short protocol

1.346 (0.967–1.875)

0.078

1.205 (0.848–1.712)

0.298

 GnRH agonist super long protocol

1.319 (0.776–2.243)

0.306

1.184 (0.688–2.037)

0.542

Other protocol

1.318 (0.402–4.323)

0.648

0.878 (0.259–2.969)

0.834

 Primary

1

1

 Secondary

1.155 (0.932–1.433)

0.188

1.034 (0.798–1.340)

0.799

 1

1

1

 2

0.828 (0.663–1.036)

0.099

0.738 (0.503–1.084)

0.121

 Cleavage-stage transfer

1

1

 Blastocyst transfer

1.089 (0.857–1.384)

0.485

0.938 (0.762–1.154)

0.542

 No

1

1

 Yes

0.577 (0.357–0.933)

0.025^a

0.471 (0.275–0.804)

0.006^a

 No

1

1

 Yes

0.218 (0.030–1.565)

0.13

0.213 (0.029–1.545)

0.126

 No

1

1

 Yes

1.195 (0.886–1.611)

0.243

1.031 (0.749–1.419)

0.853