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Table 1 Characteristics of study population

From: Inter- and intra-observer variability in Sonographic measurements of the cross-sectional diameters and area of the umbilical cord and its vessels during pregnancy

Characteristics n %
Nulliparous 103 46.6
Previous abortion 27 12.2
At least one living child 118 53.4
White 168 76.0
Age (years)   
14 – 19 21 9.5
20 – 29 98 44.3
30 – 39 85 38.5
40 – 45 17 7.7
Gestational age (weeks)   
14 – 16 7 3.2
17 – 21 23 10.4
22 – 24 23 10.4
25 – 28 43 19.5
29 – 32 50 22.6
33 – 36 30 13.6
37 – 40 45 20.4
Total 221