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Table 1 Sociodemographic and clinical characteristics of the mother-child dyads by group skin-to-skin contact

From: Randomized clinical trial of the effect of the onset time of skin-to-skin contact at birth, immediate compared to early, on the duration of breastfeeding in full term newborns

  Immediate skin-to-skin contact (n = 148) Early skin-to-skin contact (n = 149)
Maternal Characteristics
 Age, years (median - IQR) 23 (21–29) 24 (20–25)
Marital status n (%)
 Domestic partnership 112 (75.7) 109 (73.2)
 Separated/divorced 0 1 (0.67)
 Married 14 (9.5) 11 (7.4)
 Single 22 (14.9) 28 (18.8)
Educational level n (%)
 Primary education 12 (8.1) 19 (12.7)
 Secondary education 95 (64.2) 85 (57.0)
 Higher education 16 (10.8) 20 (13.4)
 Graduate education 2 (1.3) 1 (0.67)
 Technical, professional and/or technological education 22 (14.9) 17 (11.4)
 University or equivalent 1 (0.68) 7 (4.7)
 Specialization 0 0
 Doctorate 0 0
Working mother n (%)
 Yes 107 (72.3) 109 (73.1)
 No 41 (27.7) 40 (26.8)
Socio-economic stratum n (%)
 1 91 (61.5) 100 (67.1)
 2 53 (35.8) 47 (31.5)
 3 2 (1.3) 2 (1.34)
 4 1 (0.68)  
 5 1 (0.68)  
Primiparous n (%)
 Yes 79 (53.4) 81 (54.4)
 No 69 (46 .6) 68 (45.6)
Previous breastfeeding n (%)
 Yes 75 (94.9) 77 (95.1)
 No 4 (5.1) 4 (4.9)
Smoking n (%)
 Yes 1 (0.68) 1 (0.67)
 No 147 (99.3) 148 (99.3)
 Antenatal appointments, median (IQR) 8 (6–9) 7 (5–9)
BMI classification at the beginning of pregnancy n (%)
 Low weight 4 (2.7) 10 (6.7)
 Normal 105 (70.9) 95 (63.8)
 Overweight 26 (17.6) 32 (21.5)
 Obesity 13 (8.8) 12 (8.0)
Newborn characteristics
 Birthweight (grams) median (IQR) 3085 (2805–3340) 3130 (2920–3400)
 Gestational age (Weeks - Ballard) median (IQR) 39 (38–40) 39 (38–39)
Sex n (%)
 Male 66 (44.6) 71 (47.6)
 Female 82 (55.4) 78 (52.3)
  1. Immediate skin-to-skin contact: intervention initiated in the first minute after birth
  2. Early skin-to-skin contact: intervention that began exactly at 60 min of life of the newborn