Table 4.

Univariate and multivariate logistic regression analyses of the VFI and placental volume.

Variables	Univariate Logistic Regression			Multivariate Logistic Regression
	Unadjusted OR	95% CI	p	Adjusted OR	95% CI	p
First trimester
VFI	0.70	0.56–0.88	0.002 *	0.76	0.60–0.96	0.024 *
Placental volume	0.99	0.94–1.04	0.671	0.99	0.94–1.05	0.872
Second trimester
VFI	0.74	0.61–0.90	0.003 *	0.78	0.63–0.96	0.021 *
Placental volume	0.97	0.94–0.99	0.003 *	0.97	0.95–0.99	0.007 *
First trimester (per 1 SD)
VFI	0.43	0.25–0.73	0.002 *	0.43	0.25–0.73	0.002 *
Placental volume	0.91	0.59–1.41	0.671	0.99	0.65–1.52	0.969
Second trimester (per 1 SD)
VFI	0.41	0.23–0.74	0.003 *	0.39	0.21–0.74	0.004 *
Placental volume	0.39	0.22–0.73	0.003 *	0.43	0.25–0.77	0.004 *

VFI: vascularization flow index; OR: odds ratio; CI: confidence interval; SD: standard deviation. * p < 0.05.