Table 2 Sociodemographic and obstetric factors of women in this study based on the initiation of breastfeeding during the first hour of life. Multivariate analysis

Maternal age Mean (SD)

0.99 (0.97, 1.02)

0.99 (0.95, 1.03)

CARE-MQ (Grouped by percentiles)

 Percentile < 50

1

1

 Percentile 50–74

0.36 (0.27, 0.49)

0.69 (0.49, 0.97)

 Percentile 75–89

0.24 (0.17, 0.33)

0.59 (0.39, 0.87)

 Percentile ≥ 90

0.14 (0.10, 0.20)

0.43 (0.32, 0.76)

Family income

 < 1000 euros

1

1

 1000–1999 euros

1.03 (0.46, 2.30)

1.14 (0.42, 3.07)

 2000–2999 euros

1.43 (0.65, 3.15)

1.14 (0.43, 3.08)

 3000–3999 euros

1.54 (0.69, 3.40)

0.99 (0.37, 2.71)

 ≥4000 euros

1.55 (0.69, 3.48)

0.92 (0.33, 2.52)

Partner support

 None

1

1

 Little

1.91 (0.68, 5.32)

2.11 (0.60, 7.47)

 Some

1.33 (0.57, 3.09)

1.14 (0.40, 3.25)

  Sufficient

2.13 (0.98, 4.62)

1.59 (0.60, 4.21)

 A lot

2.31 (1.08, 4.91)

1.53 (0.59, 3.97)

Planned pregnancy

 No

1

1

 Yes

1.04 (0.69, 1.55)

0.94 (0.56, 1.55)

Gestational age at birth

 Term

1

1

 Moderate premature

1.05 (0.54, 2.06)

1.65 (0.68, 4.08)

Twin pregnancy

 No

1

1

 Yes

0.40 (0.16, 0.98)

0.78 (0.24, 2.50)

Previous cesarean

 No

1

1

 One

0.18 (0.14, 0.23)

1.54 (0.36, 6.54)

 Two or more

0.26 (0.14, 0.49)

0.94 (0.06, 14.43)

Number of pregnancies

 One

1

1

 Two

1.83 (1.40, 2.39)

1.32 (0.80, 2.17)

 Three or more

1.33 (0.92, 1.94)

0.65 (0.29, 1.43)

Number of vaginal births

 None

1

1

 One

5.50 (4.31, 7.01)

1.11 (0.26, 4.76)

 Two or more

14.28 (9.05, 22.52)

2.23 (0.14, 25.68)

Number of miscarriages

 None

1

1

 One

0.77 (0.60, 1.00)

0.68 (0.44, 1.04)

 Two or more

0.94 (0.62, 1.42)

0.91 (0.46, 1.82)

HT during pregnancy

 No

1

1

 Yes

0.74 (0.51, 1.05)

0.86 (0.55, 1.36)

Gestational diabetes

 No

1

1

 Yes

0.82 (0.56, 1.21)

0.89 (0.55, 1.44)

APP

 No

1

1

 Yes

1.50 (0.88, 2.55)

1.44 (0.75, 2.76)

Fertility treatment

 No

1

1

 Yes

0.71 (0.53, 095)

1.01 (0.68, 1.50)

Parity

 Primiparous

1

1

 Multiparous

2.62 (1.92, 3.58)

0.50 (0.08, 3.30)

Antenatal classes

 No

1

1

 Yes, < 5 classes

0.71 (0.49, 1.01)

1.04 (0.64, 1.69)

 Yes, at least 5 classes

0.91 (0.66, 1.24)

1.56 (1.01, 2.42)

Induction of Labor

 No

1

1

 Yes

0.58 (0.46, 0.71)

0.90 (0.67, 1.21)

Birth plan

 No

1

.

1

 Yes, but it wasn´t respected

0.52 (0.40, 0.72)

1.16 (0.86, 1.59)

 Yes, and it was mostly respected

1.85 (1.44, 2.36)

1.58 (1.01, 2.42)

Problems during childbirth

 No

1

1

  Yes

0.40 (0.32, 0.51)

0.91 (0.66, 1.26)

Use of oxytocin during birth/labor

 No

1

1

 Yes

0.57 (0.45, 0.71)

1.18 (0.85, 1.65)

Epidural anesthesia

 No

1

 Yes

0.45 (0.32, 0.62)

0.79 (0.51, 1.22)

Nitrous oxide

 No

1

1

 Yes

0.19 (0.11, 0.32)

1.02 (0.52, 2.01)

General anesthesia

 No

1

1

 Yes

0.72 (0.44, 1.16)

1.09 (0.59, 2.02)

Type of birth

 Eutocic

1

1

 Instrumental

0.55 (0.40, 0.74)

0.98 (0.66, 1.48)

 Planned cesarean section

0.35 (0.21, 0.59)

1.06 (0.25, 4.56)

 Emergency cesarean section

0.09 (0.07, 0.13)

0.43 (0.11, 1.64)

Episiotomy

 No

1

1

 Yes

1.38 (1.05, 1.82)

1.13 (0.77, 1.67)

Tear grade III-IV

 No

1

1

 Yes

0.82 (0.51, 1.33)

0.72 (0.40, 1.29)

Breastfeeding previous children

 No, this is my first child

1

1

 I did not breastfeed my previous children

1.18 (0.53, 2.59)

0.82 (0.20, 3.32)

 Yes

3.17 (2.25, 4.48)

3.57 (1.09, 11.63)

Skin-to-skin

 No

1

1

 Yes, but less than 50 min

3.95 (2.71, 5.77)

2.69 (1.70, 4.29)

 Yes, between 50 and 120 min

16.50 (10.55, 25.80)

9.64 (5.61, 16.55)

 Yes, at least 120 min

26.85 (19.40, 37.17)

13.33 (8.55, 20.80)

Maternal admission following birth

 No

1

1

 Yes

0.37 (0.21, 0.64)

0.45 (0.17, 1.23)