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Table 4 Relationship between endometrial preparation duration and pregnancy outcomes per FET in different models

From: Short (seven days) versus standard (fourteen days) oestrogen administration in a programmed frozen embryo transfer cycle: a retrospective cohort study

Pregnancy outcomes

Oestrogen priming in FET cycles

Crude model a

Adjusted model b

  

OR (95% CI)

P value

OR (95% CI)

P value

Positive pregnancy

Fourteen days

Reference

 

Reference

 
 

Seven days

0.98 (0.86 to 1.11)

0.751

0.99 (0.87 to 1.13)

0.863

Clinical pregnancy

Fourteen days

Reference

 

Reference

 
 

Seven days

0.88 (0.77 to 0.99)

0.045

0.89 (0.78 to 1.02)

0.088

Live birth

Fourteen days

Reference

 

Reference

 
 

Seven days

0.88 (0.77 to 1.01)

0.069

0.91 (0.79 to 1.05)

0.183

  1. BMI Body mass index, OR Odds ratio, CI Confidence interval, FET Frozen-thawed embryo transfer
  2. aNo adjustments for other covariates
  3. bAdjusted for female age (< 37 yrs., ≥ 37 yrs.), BMI (< 24 kg/m2, ≥ 24 kg/m2), number of transferred embryos (SET, DET), Day of FET (day 3, day 5), assisted hatching (yes, no), physicians of embryo transfer (A, B, C, and D) and endometrial thickness before FET