Table 1

Demographic and social-economic characteristics of the participants

Maternal education
Primary school and below
(N=781)
Middle school
(N=3842)
High school/vocational school
(N=1990)
College and above
(N=3795)
Mean maternal age, year (SD)28.76 (6.68)28.41 (5.21)28.26 (4.78)30.36 (4.51)
Mean pre-pregnancy BMI, kg/m2 (SD)22.67 (4.66)22.44 (4.16)21.74 (4.04)21.75 (4.12)
Mean gestational age, week (SD)39.02 (1.38)39.03 (1.40)38.94 (1.51)38.98 (1.38)
Mean infant birth weight, kg (SD)3.23 (0.47)3.33 (0.59)3.34 (0.67)3.43 (0.75)
Mean infant age, day (SD)186.50 (106.82)182.11 (104.48)178.29 (105.82)173.10 (105.52)
Infant sex, %
 Male50.6750.6452.1750.08
 Female49.3349.3647.8349.92
Parity, %
 Primiparous29.7033.8743.4962.06
 Multiparous70.3066.1356.5137.94
Delivery method, %
 Vaginal65.7756.7254.5957.01
 Caesarean section34.2343.2845.4142.99
Region, %
 Super city9.7014.1630.8261.55
 Urban43.1532.0839.0927.41
 Rural7.1525.3921.097.29
 Poor rural40.0028.379.003.75
Household income, %
 ≤40 000 yuan61.7437.4420.0611.81
 40 000–79,999 yuan22.3930.0126.2113.82
 ≥80 000 yuan3.487.8416.4038.89
Maternal occupation, %
 Agriculture related57.8933.619.372.27
 Factory workers11.5319.9520.318.66
 White-collar11.7726.7447.2373.03
 Others*18.8119.7123.0916.04
Resident status, %
 Local69.7069.1559.5053.65
 Migrant30.3030.8540.5046.35
Breastfeeding practice, %
 Early initiation64.8568.2471.1177.21
 Current BF87.8888.5385.0986.21
 Ever BF95.5297.3197.6597.93
 Exclusive BF (0–6 months)26.5315.3613.6414.06
 Predominant BF (0–6 months)50.0039.9918.4439.29
Health-seeking behaviours
 Considered feeding method before pregnancy28.3145.3550.2455.29
 Attended mother support group8.2424.4038.2049.36
 Received breastfeeding education38.5947.2359.1364.23
  • *Others refer to unidentified occupation, unemployed and housewives

  • BF, breast feeding; BMI, body mass index; ever BF, ever brest fed.