Bilirubin values. Box plots showing medians and interquartile ranges (IQRs, shaded regions) for (A) serum total and (B) indirect bilirubin values by study, with error bars indicating 1.5 × IQR, shown on a log-scale on the y-axis. The horizontal line within the shaded regions is the median bilirubin level per genotype, with outliers denoted as filled circles. Numbers (N) with each genotype are indicated above each figure, with genotypes coded as 1 = 5/5; 2 = 5/6; 3 = 5/7; 5 = 6/6; 6 = 6/7; 7 = 6/8; 8 = 7/7; 9 = 7/8; and 10 = 8/8. *Genotypes are significantly different (P < .001) from genotype 5.