Legends
FIGURE 1 The distribution of blood type in the Affiliated Hospital of Qingdao University. The percentage of type-O (O pos.), type-A (A pos.), type-B (B pos.) and type-AB (AB pos.) of blood donors in the Affiliated Hospital of Qingdao University in northern China was 28.54%, 29.05%, 31.44% and 10.97%.
FIGURE 2 Significant differences between O-A/B and DAT-pos/neg subgroups. (a) The Hb levels in DAT-positive (DAT-pos.) group (135.3±21.2 g/L) were lower than that in DAT-negative (DAT-neg.) group (143.8±24.0 g/L). Values are expressed as the mean ± SD. *P< 0.05 by Student’s t-test. (b) Infants with blood typeA (18.26%) have a higher DAT positive rate than those with blood type B (10.64%). *P < 0.05 by chi-square test.
FIGURE 3 The correlation analysis between peak TSB levels and postnatal age of admission. The postnatal age of admission was positively correlated with the levels of peak TSB (r = 0.54, P<0.001).
FIGURE 4 Significant differences between the non-/severe hyperbilirubinemia groups and different postnatal age of admission groups. (a) Peak TSB levels were significantly lower in the postnatal age of admission less than 1-day group than in the other three groups, as well as in infants admitted at 2-3 days postnatal than in those admitted at 4-13 days postnatal. Values are expressed as the median ± 95%CI. *P < 0.05 and **P < 0.001 by Kruskal-Wallis H test and P value adjusted by Bonferroni correction. (b) The severe hyperbilirubinemia infants had a later postnatal age of admission than infants that did not develop severe hyperbilirubinemia. Values are expressed as the mean ± SEM. *P < 0.001 by Mann–Whitney U test.