Table 2.

Univariate analysis and multivariate Logistic regression analysis

	Univariate analysis OR (95% CI)	P	Multivariate analysis OR (95% CI)	P
Age	0.99 (0.88, 1.11)	0.799	–	–
Endometrial thickness	1.18 (0.92, 1.51)	0.191	0.70 (0.52, 0.94)	0.019
Endometrial volume	1.53 (1.03, 2.28)	0.037	1.54 (0.98, 2.41)	0.062
Endometrial morphology
Type A	Control	–	Control	–
Type B	6.47 (0.69, 60.68)	0.102	2.58 (0.13,51.8)	0.536
Type C	2.00 (0.13, 29.81)	0.615	7.86 (0.21, 299.19)	0.267
Uterine artery mPI	1.12 (0.24, 5.26)	0.890	–	–
Uterine artery mRI	1.62 (0.00, 2.98e+5)	0.938	–	–
Uterine artery mS/D	1.07 (0.7, 1.63)	0.752	–	–
VI	1.60 (1.03, 2.48)	0.036	–	–
FI	1.10 (0.93, 1.31)	0.27	–	–
VFI	17.08 (1.36, 215.12)	0.028	33.3 (1.6, 692.38)	0.024
Sub-endometrial blood flow
Type I	Control		Control
Type II	3.07 (0.91, 10.37)	0.071	0.70 (0.11, 4.44)	0.704
Type III	2.17 (0.24, 19.28)	0.488	0.50(0.02, 11.44)	0.663
Endometrial peristalsis
Type I	0.83 (0.04, 16.99)	0.906	–	–
Type II	Control
Type III	2.00 (0.05, 78.25)	0.711	–	–
Type IV	5.76e+6 (0.00, ∞)	0.991	–	–
Type V	0.84 (0.05, 14.57)	0.906	–	–

e+5, 10⁵; e+6, 10⁶; ∞, positive infinity