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Table 1 Demographic characteristic of the sample (N = 956)

From: A prospective study of maternal postnatal depressive symptoms with infant-feeding practices in a Chinese birth cohort

Variables N %
Maternal age (years)
  < 25 48 5.0
 25–29 441 46.1
 30–34 348 36.4
  ≥ 35 119 12.5
Maternal education attainment
  ≤ Junior school 32 3.3
 High school 122 12.8
  ≥ College graduate 802 83.9
Pre-pregnancy BMIa (kg/m2)
  < 18.5 4 0.4
 18.5–23.9 181 18.9
  ≥ 24 771 80.6
Household income (yuan)
  < 2000 31 3.2
 2000–5000 521 54.5
 5001–10,000 367 38.4
  > 10,000 37 3.9
Mode of delivery
 Vaginal delivery 575 60.1
 Cesarean delivery 381 39.9
Gestational age (weeks)
  < 28 0 0
 28–36 46 4.8
 37–42 910 95.2
  > 42 0 0
Pregnancy-related complications
 No 819 85.7
 Yes 137 14.3
Active smoking during pregnancy  
 No 947 99.1
 Yes 9 0.9
Passive smoking during pregnancy
 No 863 90.3
 Yes 93 9.7
Parity
 Nulliparous 686 71.8
 Multiparous 270 28.2
Screened positive for symptoms of PND (EPDS ≥10)
 No 900 94.1
 Yes 56 5.9
Screened positive for major PND (EPDS ≥13)
 No 927 97.0
 Yes 29 3.0
Using feeding-bottle/ nipple before breastfed
 No 791 82.7
 Yes 165 17.3
Infant gender
 Male 493 51.6
 Female 463 48.4
Initiation of breastfeeding (hours)
  < 1 725 75.8
 1–24 118 12.3
  > 24 113 11.8
  1. a BMI body mass index, PND postnatal depression