Table 2.

Summary of the Mean ETCOc at 30 ± 6 Hours of Life (Mean ± SD) for the Total Study Population and Subcategories

CategorySubcategoryMean ETCOc (at 30 ± 6 Hours)*
Total InfantsInfants With STB ≥95%
n(%)ETCOcn(%)ETCOcP
All1370 (100)1.48 ± 0.49120 (8.8)1.81 ± 0.59≤.0001
GenderMale671 (49.0)1.50 ± 0.4963 (9.5)1.87 ± 0.62≤.0001
Female699 (51.0)1.46 ± 0.4957 (8.2)1.74 ± 0.55≤.0001
Birth weight (g)≥mean685 (50.0)1.55 ± 0.5050 (7.5)1.99 ± 0.62≤.0001
<mean685 (50.0)1.41 ± 0.4670 (10.2)1.67 ± 0.53≤.0001
RaceAsian/Pacific Islander533 (38.9)1.37 ± 0.5053 (9.9)1.71 ± 0.64≤.0001
Black224 (16.4)1.42 ± 0.4411 (4.9)1.80 ± 0.48≤.0055
Hispanic53 (3.9)1.56 ± 0.491 (1.9)2.49NA
White454 (33.1)1.61 ± 0.4650 (11.0)1.92 ± 0.54≤.0001
Other106 (7.7)1.57 ± 0.516 (5.7)1.62 ± 0.59NS
Cephalhematoma55 (4.0)1.54 ± 0.509 (16.4)1.88 ± 0.46NS
Bruising107 (7.8)1.71 ± 0.5523 (21.5)1.85 ± 0.59NS
Breast milk only476 (34.7)1.60 ± 0.4747 (9.9)1.87 ± 0.57.0003
Coombs' positive54 (3.9)1.66 ± 0.55§10 (18.5)1.89 ± 0.63NS
Coombs' negative519 (37.9)1.48 ± 0.5154 (10.4)1.89 ± 0.55≤.0001
  • NA indicates not applicable; NS, not significant.*The ETCOc values for the 577 infants measured with the preproduction sampler were adjusted to the mean ± SD of the 793 infants measured using the production sampler.

  • Comparison of ETCOc values of infants with STB ≥ the 95th percentile with those of the total infant population in each subcategory.

  • § P < .00932, when compared with the total population.