Table 1

Centiles (95% CI—calculated using bootstrapping with 5000 repetitions) of split bilirubin levels (µmol/L) by age group at measurement—summary of raw data

Age (days)Number of samplesCentile
0th minimum5th25th50th median75th95th100th maximum
Total bilirubin
 11–1721512100 (79, 113) 140 (132, 151) 168 (161, 177) 208 (197, 214) 254 (242, 287) 318
 18–241725697 (83, 104) 122 (117, 130) 153 (145, 159) 188 (172, 205) 261 (233, 291) 306
 25–31596872 (68, 97) 126 (103, 139) 153 (139, 176) 182 (176, 212) 263 (215, 308) 308
 32–42362733 (27, 92) 112 (61, 129) 146 (122, 158) 175 (154, 209) 262 (206, 286) 286
 43+1768108 (68, 118) 122 (108, 150) 150 (126, 184) 184
Direct bilirubin
 11–172133(6, 7) 10 (9, 11) 14 (13, 15) 18 (17, 19) 24 (22, 28) 31
 18–241721(3, 8) 11 (10, 12) 15 (13, 16) 18 (18, 20) 26 (22, 29) 34
 25–31595(5, 8) 11 (9, 14) 15 (14, 18) 19 (18, 24) 27 (24, 32) 32
 32–42352(2, 6) 12 (5, 14) 16 (12, 18) 20 (17, 21) 28 (21, 31) 31
 43+17713 (7, 15) 16 (13, 18) 18 (16, 20) 20
Direct–total bilirubin ratio
 11–172120.0190.039 (0.028, 0.043) 0.063 (0.058, 0.067) 0.082 (0.075, 0.086) 0.103 (0.097, 0.114) 0.148 (0.133, 0.178) 0.500
 18–241710.0070.043 (0.015, 0.055) 0.075 (0.070, 0.082) 0.095 (0.090, 0.099) 0.123 (0.109, 0.136) 0.176 (0.162, 0.194) 0.372
 25–31590.0220.033 (0.216, 0.489) 0.071 (0.054. 0.087) 0.109 (0.087, 0.123) 0.137 (0.123, 0.151) 0.200 (0.157, 0.451) 0.451
 32–42350.0160.017 (0.016, 0.050) 0.085 (0.046, 0.098) 0.101 (0.090, 0.125) 0.142 (0.112, 0.197) 0.513 (0.185, 0.556) 0.556
 43+170.0590.094 (0.060, 0.105) 0.126 (0.095, 0.156) 0.156 (0.132, 0.294) 0.294
  • N.B. Values are non-parametric estimates