Table 2.

Multiple logistic regression analysis for variables independently associated with the occurence of an isolated single umbilical artery

	Wald	OR (95% CI)	p value
Positive smoking status	4.519	3.556 (1.104–11.45)	0.034
Assited reproduction	2.540	3.76 (0.738–19.168)	0.11
Rhesus incompatibility	0.993	1.73 (0.589–5.081)	0.31
Maternal age	0.965	0.972(0.919–1.029)	0.326
Body Mass Index (kg/m2)	0.158	1.016(0.941–1.097)	0.691
Constant	1.268	0.844	0.26

Cl: Confidence interval

OR: Odd ratio