TABLE 1

Subject characteristics

CharacteristicValuesa
SecretorsNonsecretors
Lactation day (no. of milk samples/no. of feces samples)
    643/4313/13
    4235/3910/10
    12025/246/7
    18019/215/6
Maternal age (yrs)27.50 ± 0.52129.00 ± 1.517
Maternal BMIb (kg/m2)25.89 ± 5.13627.02 ± 3.115
Gestation duration (wk)38.52 ± 1.33339.45 ± 2.165
% of male infants (no. of males/total no. of infants)41.86 (18/25)46.15 (6/7)
Body weight of infants (kg) on lactation day:
    Birth3.314 ± 0.0943.191 ± 0.233
    63.345 ± 0.0873.394 ± 0.187
    424.914 ± 0.1595.033 ± 0.638
    1207.473 ± 0.2317.600 ± 0.724
    1808.617 ± 0.3079.167 ± 0.833
  • a Other than the sample numbers and the numbers of infants, data represent means ± standard deviations (SD). All of the infants were delivered vaginally and fed via breastfeeding.

  • bBMI, body mass index.