Table 1 Original distributions of creatinine and urea in the PRINCE data and the LIS data
Age Group | PRINCE | Transferred PRINCE | LIS | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Boys | Girls | Boys | Girls | Boys | Girls | |||||||||||||
n | Mean | SD | n | Mean | SD | n | Mean | SD | n | Mean | SD | n | Mean | SD | n | Mean | SD | |
Creatinine (μmol/L) | ||||||||||||||||||
1 to < 2 years | 269 | 25.0 | 3.7 | 229 | 24.1 | 3.7 | 269 | 22.6 | 3.4 | 229 | 21.8 | 3.5 | 9137 | 25.27 | 6.48 | 6004 | 25.06 | 7.05 |
2 to < 3 years | 320 | 28.7 | 4.3 | 292 | 28.9 | 4.5 | 320 | 26.1 | 4.0 | 292 | 26.2 | 4.2 | 8431 | 27.34 | 7.02 | 5218 | 26.75 | 7.14 |
3 to < 4 years | 462 | 32.6 | 4.3 | 355 | 31.1 | 4.1 | 462 | 29.8 | 4.0 | 355 | 28.4 | 3.8 | 7783 | 29.79 | 7.57 | 5243 | 29.18 | 7.43 |
4 to < 5 years | 315 | 35.0 | 4.6 | 316 | 34.6 | 4.4 | 315 | 32.0 | 4.3 | 316 | 31.6 | 4.2 | 7102 | 31.85 | 7.59 | 4762 | 31.13 | 7.55 |
5 to < 6 years | 307 | 37.1 | 4.5 | 302 | 37.0 | 4.5 | 307 | 33.9 | 4.2 | 302 | 33.9 | 4.2 | 5856 | 33.57 | 7.97 | 3933 | 32.73 | 7.83 |
6 to < 7 years | 384 | 41.2 | 5.2 | 350 | 40.2 | 4.9 | 384 | 37.8 | 4.9 | 350 | 36.8 | 4.6 | 4847 | 37.18 | 8.10 | 3352 | 36.38 | 8.01 |
7 to < 8 years | 414 | 42.0 | 5.2 | 374 | 41.0 | 4.9 | 414 | 38.5 | 4.9 | 374 | 37.6 | 4.6 | 4590 | 38.94 | 8.60 | 3538 | 38.23 | 8.44 |
8 to < 9 years | 405 | 44.0 | 5.5 | 404 | 43.1 | 5.6 | 405 | 40.4 | 5.1 | 404 | 39.6 | 5.2 | 4769 | 40.98 | 9.35 | 3735 | 39.95 | 8.78 |
9 to < 10 years | 389 | 46.1 | 5.3 | 369 | 45.2 | 5.3 | 389 | 42.3 | 4.9 | 369 | 41.5 | 5.0 | 4115 | 41.82 | 9.35 | 3507 | 40.47 | 9.06 |
10 to < 11 years | 402 | 48.5 | 5.5 | 381 | 45.4 | 5.3 | 402 | 44.6 | 5.2 | 381 | 41.7 | 5.0 | 3568 | 43.74 | 9.60 | 2794 | 42.17 | 9.56 |
11 to < 12 years | 292 | 49.1 | 5.5 | 305 | 45.5 | 5.7 | 292 | 45.2 | 5.1 | 305 | 41.8 | 5.3 | 3419 | 46.25 | 9.72 | 2678 | 43.72 | 9.80 |
12 to < 13 years | 408 | 55.4 | 8.6 | 379 | 51.3 | 8.1 | 408 | 51.1 | 8.0 | 379 | 47.3 | 7.5 | 2718 | 49.18 | 11.24 | 2079 | 45.82 | 11.01 |
13 to < 14 years | 287 | 59.9 | 10.0 | 309 | 53.6 | 7.9 | 287 | 55.3 | 9.4 | 309 | 49.4 | 7.4 | 2418 | 53.81 | 13.06 | 1957 | 48.65 | 11.55 |
14 to < 15 years | 229 | 66.9 | 11.1 | 242 | 55.9 | 7.7 | 229 | 61.9 | 10.4 | 242 | 51.6 | 7.2 | 1503 | 57.31 | 12.61 | 1163 | 50.68 | 10.94 |
15 to < 16 years | 311 | 75.6 | 11.4 | 377 | 60.6 | 7.7 | 311 | 70.0 | 10.7 | 377 | 56.0 | 7.2 | 957 | 59.78 | 14.38 | 772 | 52.32 | 11.59 |
16 to < 17 years | 220 | 77.9 | 10.8 | 287 | 61.9 | 8.1 | 220 | 72.2 | 10.1 | 287 | 57.1 | 7.6 | 605 | 62.66 | 12.57 | 552 | 54.13 | 11.58 |
Urea (mmol/L) | ||||||||||||||||||
1 to < 17 years | 5413 | 4.44 | 0.98 | 5250 | 4.10 | 0.94 | 5413 | 4.50 | 1.00 | 5250 | 4.15 | 0.96 | 71,486 | 4.35 | 1.33 | 50,935 | 4.15 | 1.32 |