Table 1 Summarizes the clinical characteristics of the study population (N = 742)

Age (years) ^a

34.07 ± 3.845

30.67 ± 4.45

0.003

BMI ^a

27.20 ± 2.85

27.899 ± 3.63

0.459

Gravida ^a

3.73 ± 1.67

2.73 ± 1.63

0.018

Para ^a

2.13 ± 0.64

1.74 ± 0.73

0.04

Gestational age ^a

37.53 ± 1.64

37.87 ± 2.05

0.527

Birth Weight ^a

3267.69 ± 491.40

3222.69 ± 538.05

0.765

Emergency CS

7(47%)

334(46%)

0.947

Diabetes mellitus

2(13%)

130(18%)

0.631

Hypertensive disorders during pregnancy

1(7%)

80(11%)

0.566

RCOG score

0.09

 ≥ 4

3 (20%)

106 (14.6%)

 2 and 3

12 (80%)

458 (63%)

 1

0 (0)

163 (22.4%)

Results of CUS (Day 1)

0.00

 VTE

10 (66.7%)

0

 Abnormal

2 (13.3%)

61 (8.4%)

 Normal

3 (10%)

666 (91.6%)

D-dimer ≥ 3 (Day 1) ^b

0.001

 Yes

14 (93.3%)

478 (65.7%)

 No

1 (6.7%)

249 (34.3%)

D-dimer (mg/l EFU) (Day 1) ^a

12.08 ± 10.45

6.05 ± 6.03

0.049