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Table 1 Sociodemographic and baseline characteristics x gestational age at birth

From: Association between cervical length and gestational age at birth in singleton pregnancies: a multicentric prospective cohort study in the Brazilian population

Characteristics

Overall PTB < 37 (n = 453)

 ≥ 37w (n = 2686)

OR (95%CI)

Spontaneous (sPTB) < 37 (n = 223)

 ≥ 37w (n = 2686)

OR (95%CI)

 

n or Mean

% or ± SD

n or Mean

% or ± SD

 

n or Mean

% or ± SD

n or Mean

% or ± SD

 

Maternal age at measurement (years)

28.7

 ± 7

27.8

 ± 7

 

27.4

 ± 6.9

27.8

 ± 7

 

 ≤ 19

56

12.4

405

15.1

 

36

16.2

405

15.1

 

 20– ≤ 34

307

67.9

1794

67.1

1.24 (0.92–1.69)

152

68.5

1794

67.1

0.95 (0.66–1.41)

 > 35

89

19.7

476

17.8

1.35 (0.95–1.95)

34

15.3

476

17.8

0.80 (0.49–1.31)

Body-mass index (kg/m2)

          

 ≤ 18.5

16

3.5

52

1.9

1.95 (1.05–3.43)

10

4.5

52

1.9

2.07 (0.96–4.06)

 18.5–25

148

32.7

937

34.9

 

87

39.0

937

34.9

 

 25–30

157

34.7

913

34.0

1.09 (0.85–1.39)

72

32.3

913

34.0

0.85 (0.61–1.17)

 > 30

132

29.1

784

29.2

1.07 (0.83–1.37)

54

24.2

784

29.2

0.74 (0.52–1.05)

Ethnic origin (self-reported)

          

 Non-white

289

63.8

1680

62.5

 

143

64.1

1680

62.5

 

 White

164

36.2

1006

37.5

0.95 (0.77–1.16)

80

35.9

1006

37.5

0.93 (0.70–1.24)

Schooling

          

 Preschool, elementary

116

25.8

711

26.6

 

55

24.9

711

26.6

 

 Middle school

275

61.2

1666

62.3

1.01 (0.80–1.28)

140

63.3

1666

62.3

1.09 (0.79–1.51)

 High school and higher education

58

12.9

298

11.1

1.19 (0.84–1.67)

26

11.8

298

11.1

1.13 (0.68–1.81)

Comorbidities

          

 No comorbidities

285

62.9

1992

74.2

 

163

73.1

1992

74.2

 

 Hypertension

47

10.4

153

5.7

2.15 (1.50–3.02)

8

3.6

153

5.7

0.64 (0.28–1.24)

 Endocrinopathiesa

63

13.9

254

9.5

1.73 (1.27–2.33)

28

12.6

254

9.5

1.35 (0.87–2.02)

 Cardiovascular disease

2

0.4

18

0. 7

0.78 (0.12–2.71)

1

0.45

18

0.7

0.68 (0.04–3.32)

 Othersb

56

12.4

269

10.0

1.46 (1.06–1.98)

23

10.3

269

10.0

1.04 (0.65–1.61)

Previous conization(yes)

9

1.9

36

1.3

1.33 (0.57–2.73)

3

1.3

36

1.3

1.00 (0.24–2.81)

Uterine anomaly (yes)

9

1.9

36

1.3

1.50 (0.67–2.99)

3

1.3

36

1.3

1.00 (0.24–2.81)

Obstetrical history

          

 Nulliparous

205

45.4

1244

46.3

 

109

48.9

1244

46.3

 

 Parous with no previous PTB

154

34.1

1217

45.3

0.77 (0.61–0.96)

69

30.9

1217

45.3

0.65 (0.47–0.88)

 Parous with at least one previous PTB

93

20.6

225

8.4

2.51 (1.88–3.32)

45

20.2

225

8.4

2.28 (1.56–3.30)

 Previous miscarriage (yes)

138

30.5

629

23.4

1.43 (1.15–1.78)

69

30.9

629

23.4

1.47 (1.08–1.97)

Characteristics

Spontaneous (sPTB) < 34 (n = 78)

 ≥ 34w (n = 2976)

OR (95%CI)

 

n or Mean

% or ± SD

n or Mean

% or ± SD

 

Maternal age at measurement (years)

27.1

 ± 7.2

27.9

6.9

 

 ≤ 19

15

19.2

437

14.7

 

 20– ≤ 34

49

62.8

2002

67.5

0.71 (0.41–1.33)

 > 35

14

17.9

525

17.7

0.78 (0.37–1.63)

Body-mass index (kg/m2)

     

 ≤ 18.5

6

7.7

62

2.1

3.01 (1.10–6.98)

 18.5–25

33

42.3

1026

34.5

 

 25–30

23

29.5

1021

34.3

0.70 (0.40–1.19)

 > 30

16

20.5

867

29.1

0.57 (0.31–1.03)

Ethnic origin (self-reported)

     

 Non-white

46

59.0

1869

62.8

 

 White

32

41.0

1107

37.2

1.17 (0.74–1.85)

Schooling

     

 Preschool, elementary

18

23.1

784

26.5

 

 Middle school

50

64.1

1842

62.2

1.18 (0.70–2.09)

 High school and higher education

10

12.8

335

11.3

1.30 (0.57–2.79)

Comorbidities

     

 No comorbidities

50

64.1

2180

73.3

 

 Hypertension

3

3.8

181

6.1

0.72 (0.17–1.99)

 Endocrinopathiesa

12

15.4

294

9.9

1.78 (0.90–3.27)

 Cardiovascular disease

0

0.0

20

0.7

 Othersb

13

16.7

301

10.1

1.88 (0.97–3.40)

Previous conization(yes)

2

2.6

41

1.4

1.88 (0.30–6.28)

Uterine anomaly (yes)

1

1.3

38

1.3

1.00 (0.06–4.72)

Obstetrical history

     

 Nulliparous

44

56.4

1363

45.8

 

 Parous with no previous PTB

17

21.8

1330

44.7

0.40 (0.22–0.68)

 Parous with at least one previous PTB

17

21.8

282

9.5

1.87 (1.02–3.26)

 Previous miscarriage (yes)

27

34.6

709

23.8

1.69 (1.04–2.70)

  1. Data are number (%) or mean (± SD). OR values in bold mean that they are significant at a P-value < 0.05. BMI was calculated at CL measurement
  2. aDiabetes Mellitus, gestational diabetes, thyroidopathy
  3. bAsthma, autoimmune diseases, anemia, obesity, hepatitis