What is TRUE with the findings of a single umbilical aery on examination of the umbilical cord

The incidence of a single aery is significantly increased in newborns of diabetic mothers, and it occurs in white infants twice as often as in newborns of black women. The incidence of major fetal malformations when only one aery is identified has been repoed to be as high as 18%, and there is an increased incidence of overall fetal moality.