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Table 1 Characteristics of participants according to Hb category levels (n = 1532)

From: A relationship between a level of hemoglobin after delivery and exclusive breastfeeding initiation at a baby friendly hospital in Japan

  Hb < 9.0 9.0 ≤ Hb ≤ 11.0 12.0 ≤ Hb P*
n = 205 n = 762 n = 565
N % N % N %
Maternal age, years, mean ± SD 33.9 5.4 34.1 4.8 33.7 5.1 0.484
Pre-pregnancy BMI, kg/m2     0.925
  < 18.5 48 23.4 175 23.0 135 23.9  
 18.5–24.9 157 76.6 587 77.0 430 76.1  
Nulliparity 153 74.6 492 64.6 323 57.2 <0.001
Caesarean section 49 24.0 134 17.6 61 10.8 <0.001
Pregnancy Induced Hypertension 17 8.3 26 3.4 17 3.0 0.002
Gestational week at delivery, mean ± SD 39.5 1.1 39.4 1.1 39.2 1.1 <0.001
Bleeding amount at delivery, mean ± SD 907.6 473.5 519.1 291.4 366.8 254.2 <0.001
Birth weight of infant, mean ± SD 3127.8 345.1 3083.4 354.3 3029.1 352.0 <0.001
Immediate separation after delivery 21 10.2 51 6.7 34 6.0 0.117
Breastfeeding at discharge 149 72.7 624 81.9 484 85.7 <0.001
Breastfeeding at 1 month 126 63.0 518 68.9 422 75.9 <0.001
  1. *Based on Chi-square test or Analysis of Variance