Table 3.

Univariate linear regression analysis (Model 1) of factors associated with initial serum β-hCG levels

Variable	Unstandardized Coefficient	Standardized Coefficient	t-value	p-value
PGT vs. non-PGT	−7.942	0.039	2.181	0.029*
Maternal age	0.202	0.022	0.711	0.476
BMI	−4.094	−0.175	−10.731	< 0.001*
Duration of infertility	−0.032	−0.018	−1.010	0.312
Endometrial thickness	−0.060	−0.021	−1.471	0.145
Previous spontaneous miscarriage	−27.004	−0.205	−11.721	< 0.001*
Day of blastocyst transfer	−16.439	−0.037	−2.037	0.042*
Blastocyst grading	9.585	0.141	8.540	< 0.001*

Asterisk (*) indicates statistical significance, defined as p < 0.05