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Table 1 Characteristics of Mother-Infant Dyads from the Mother’s Milk Study at 1 and 6 Months Postpartum

From: Prenatal exposure to ambient air pollutants and early infant growth and adiposity in the Southern California Mother’s Milk Study

  1 Month
Mean ± SD
6 Months
Mean ± SD
Maternal Characteristics
 Maternal Age (years) 29.23 ± 6.00 29.64 ± 6.11
 Maternal BMI (kg/m2) 30.27 ± 4.86 30.88 ± 5.52
 Breastfeeding (% yes) 99.2% 78.9%
 Breastf Freq (% ≥ 7) 70.7% 27.6%
Infant Characteristics
 Age (days) 32.35 ± 3.11 185.11 ± 8.10
 Infant Sex (% male) 42.3%  
 Weight (kg) 4.63 ± 0.45 8.07 ± 0.77
 Length (cm) 54.36 ± 1.85 67.14 ± 2.20
Infant Anthropometrics
 Umbilical Circumference (cm) 36.05 ± 2.12 41.70 ± 2.69
 Total Subcutaneous Fat (mm) 29.75 ± 5.03 42.86 ± 7.81
 Central:Total Subc Fat 0.39 ± 0.04 0.32 ± 0.04
 Midthigh Skinfold (mm) 11.57 ± 2.27 20.49 ± 4.13
 Tricep Skinfold (mm) 6.50 ± 1.50 8.68 ± 2.35
 Suprailiac Skinfold (mm) 4.37 ± 1.23 5.87 ± 1.65
 Subscapular Skinfold (mm) 7.31 ± 1.68 7.81 ± 1.96
  1. 1- and 6-month characteristics of 123 Hispanic mother-infant dyads from the Southern California Mother’s Milk Study. Data are reported mean and standard deviation (SD) unless otherwise noted. Breastfeeding frequency at 6 months of age is shown dichotomized as ≥ 7 or < 7 times per day. Total subcutaneous fat is the sum of the four infant skinfold thickness measures in millimeters. The Central:Total subcutaneous fat variable is the sum of the suprailiac and subscapular skinfold thicknesses divided by all four skinfold measures