Table 1 Distribution of sociodemographic and obstetric characteristics of pregnancy

Age (years)

29 (24–33)

Educational level

  Elementary School

105 (20.75)

17.42 – 24.51

  High school

276 (54.55)

50.16 – 58.85

  Higher education

125 (24.70)

21.13 – 28.66

Ethnicity/Race^a

  White

156 (30.83)

26.94 – 35.00

  Black

36(7.11)

5.16 – 9.71

  Brown

304(60.08)

55.73 – 64.27

  Yellow

8(1.58)

0.79 – 3.13

  Indigenous

2(0.40)

0.09 – 1.57

Civil status

  Stable union

387 (76.48)

72.57 – 79.98

  Without companion

119 (23.52)

20.01 – 27.42

Smoking in the first 5 months of pregnancy

  No

473 (93.48)

90.95 – 95.33

  Yes

33 (6.52)

04.66 – 09.04

Alcohol consumption during pregnancy

  No

447 (88.69)

85.60 – 91.18

  Yes

57 (11.31)

08.81 – 14.39

Gestational diabetes

  No

472 (93.47)

90.94 – 95.32

  Yes

33 (6.53)

04.68—09.06

Non-gestational diabetes

  No

228 (96.61)

93.33 – 98.30

  Yes

8 (3.39)

01.69 – 06.66

Pre-eclampsia

  No

431 (85.18)

81.79 – 88.02

  Yes

73 (14.43)

11.61 – 17.78

Parity

  Primiparous

272 (53.75)

49.38 – 58.07

  Multiparous

234 (46.25)

41.92 – 50.62

Gestational age (weeks)

39 (38–40)

Number of PN consultations

   ≥ 6

414 (92.20)

89.32 – 94.35

   < 6

35 (7.80)

05.64 – 10.67

Professional who attended predominantly PN consultations

  Nurse

48 (9.49)

07.21 – 12.37

  Physician

458 (90.51)

87.62 – 92.78

Place where PN consultations were predominantly carried out

  Public

269 (55.69)

51.21 – 60.08

  Private

214 (44.31)

39.91 – 48.78