Regrouping based on the cut-off value to investigate whether embryo stages were an independent risk factor for pregnancy outcomes
Multivariable logistic regression analysis on the cohort with an average distance under 2.146 cm demonstrated no statistically significant differences in the CPR and LBR between the blastocyst transfer and cleavage-stage ET groups (CPR: adjusted OR 2.165, 95% CI 0.284-16.494; LBR: adjusted OR 1.494, 95% CI 0.225-9.908; P > 0.05), which were adjusted for maternal age, BMI, outcomes of the COH cycle, insemination method, number of embryos transferred, and infertility causes.
Multivariable logistic regression analysis on the cohort with an average distance ≥ 2.146 cm demonstrated that the CRP and LBR of the blastocyst transfer group were significantly higher than those of the cleavage-stage ET group (CPR: adjusted OR 9.834, 95% CI 2.035-47.526; LBR: adjusted OR 4.135, 95% CI 1.063-16.083) (P < 0.05) (Tables S2, S3).