TABLE 1

Demographic and Clinical Characteristics of Infants Exposed to Phototherapy and 2 Groups of Unexposed Infants

PhototherapyNo Phototherapy
≥1 TSB −3 to 4.9 mg/dL From Phototherapy ThresholdNo TSB −3 to 4.9 mg/dL From Phototherapy Threshold
Number of infants39 40362 592397 626
Year of birth ≥2003, %79.266.150.8
Male, %56.053.850.2
Race, %
 White34.038.743.7
 Black4.95.18.5
 Asian30.424.816.6
 Hispanic23.624.224.2
 Other or unknown7.27.17.0
Down syndrome, %0.530.210.05
Other chromosomal anomaly, %0.30.20.1
Congenital anomaly, %3.82.41.8
Birth wt, mean ± SD, g3260 ± 5893354 ± 5263467 ± 493
Birth wt ≥4500 g, %1.91.92.2
Gestational age, mean ± SD, wk38.2 ± 1.738.6 ± 1.639.3 ± 1.3
5-minute Apgar <7, %1.60.80.8
Maximum TSB, mean ± SD, mg/dL16.5 ± 3.815.2 ± 3.3N/A
Maximum TSB, mg/dL, %
 Not done or not found0.40.061.7
 <103.28.324.3
 10–14.929.533.511.9
 15–19.950.153.42.2
 20–24.915.74.70.0
 ≥251.20.10.0
Direct antiglobulin test result, %
 Positive1161
 Negative585031
 Not done314368
Follow-up, y6.2 ± 4.37.3 ± 4.98.4 ± 5.3
  • P values comparing the 3 phototherapy exposure groups with χ2 or ANOVA tests were <.001 for all variables in the table. N/A, not applicable.