Table 1 General characteristics of the population.

From: Mid-trimester prediction of spontaneous preterm birth with automated cervical quantitative ultrasound texture analysis and cervical length: a prospective study

 

Total N = 633

Term birth N = 610 (96.4%)

sPTB < 37 N = 23 (3.6%)

sPTB < 34 N = 7 (1.1%)

p value *

p value **

Maternal age (years)

33.5 (5.3)

33.5 (5.2)

33.5 (6.0)

34.5 (5.7)

0.98

0.61

BMI

24.0 (4.1)

24.0 (4.0)

25.2 (5.5)

23.1 (3.1)

0.16

0.54

Caucasian

434 (68.6%)

419 (68.7%)

15 (65.2%)

5 (71.4%)

0.73

0.87

Tobacco use

49 (7.7%)

45 (7.4%)

4 (17.4%)

2 (28.6%)

0.08

0.04

Nuliparous

332 (52.4%)

322 (52.8%)

10 (43.5%)

4 (57.1%)

0.38

0.80

PPTB37

13 (2.1%)

13 (2.1%)

0 (0.0%)

0 (0.0%)

0.48

0.70

PPTB34

9 (1.4%)

9 (1.5%)

0 (0.0%)

0 (0.0%)

0.56

0.75

GA (weeks)

20.8 (1.0)

20.8 (1.0)

20.7 (0.9)

20.9 (0.6)

0.67

0.73

CL (mm)

40.7 (7.5)

40.8 (7.5)

38.9 (8.9)

35.7 (8.2)

0.25

0.08

CL <  = 25 mm

5 (0.8%)

3 (0.5%)

2 (8.7%)

1 (14.3%)

0.00

0.00

Uterine factor

30 (4.7%)

26 (4.3%)

4 (17.4%)

0 (0.0%)

0.27

0.55

Spontaneous onset of labour

360 (56.9%)

337 (55.2%)

23 (100%)

7 (100%)

0.00

0.02

Vaginal delivery

472 (74.6%)

457 (74.9%)

15 (65.2%)

5 (71.4%)

0.30

0.85

GA at delivery (weeks)

39.1 (3.1)

39.4 (2.7)

32.9 (5.1)

26.9 (6.0)

0.00

0.00

Birthweight (g)

3276.0 (475.4)

3300.0 (450.6)

2641.9 (660.2)

2509.0 (1052.6)

0.00

0.00

Progesterone

1 (0.1%)

0

1 (4%)

1 (14%)

0.00

0.00

  1. Data given as: mean (std) or n (%). BMI body mass index, GA gestational age, sPTB spontaneous preterm birth, CL cervical length, PPTB37 previous preterm birth at week 37, PPTB34 previous preterm birth at week 34. Uterine Factor Uterine conisation or malformation. p value, fisher exact test (discrete variables) or t-test (continuous variables) significance value between cases and controls. Progesterone, Patient received progesterone.
  2. *Comparison between term group and sPTB < 37 weeks.
  3. **Comparison between term group and sPTB < 34 weeks.