D6 blastocyst transfer on day 6 in frozen-thawed cycles should be avoided: a retrospective cohort study

Table 3 Multivariable logistic regression analysis of the factors affecting CPR

	OR	95% CI	P-value
Maternal age	0.957	0.922–0.993	0.020
Paternal age	1.006	0.974–1.039	0.712
BMI	1.020	0.983–1.058	0.295
Type of infertility	1.015	0.825–1.250	0.885
Previous failures^a			0.202
Endometrial thickness	1.074	0.995–1.160	0.066
Endometrial preparation	0.995	0.797–1.242	0.966
Physician performing the transfers^a			0.969
Number of blastocyst transferred	1.502	1.164–1.939	0.002
Quality of blastocysts transferred	1.631	1.266–2.101	0.000
Category of blastocyst transfer			0.000
D5 versus D6-on-D6	2.951	2.289–3.805	0.000
D6-on-D5 versus D6-on-D6	2.031	1.296–3.182	0.002

OR odds ratio, CI confidence interval, BMI body mass index
The total sample size of the logistic model was 1788 FET cycles with blastocysts
^aThe number of dummy variables is excessively long to list

ISSN: 1471-2393