Dr. Aase's question about the possibility that differences in exposure to light might have accounted for our observed differences in bilirubin levels is, of course, germane.

During the course of our study, we became aware of the reports which described the effect of light on degradation of bilirubin. However, we could determine no differences in light exposure between the two populations under study nor, because of the physical arrangements of the nurseries, did there appear to be any possibility that there would be seasonal variations in the amount of light exposure.

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