Table 2.
The reference intervals (RI) and confidence intervals (CI) for creatinine-adjusted urinary NGAL levels for children. The ratio of the 90% confidence interval to the reference interval of the 97.5th quantile is given as the CI:RI ratio.
| Age Group/Years | Urinary NGAL Concentration/(ng/mg Cr) | CI:RI Ratio | ||
|---|---|---|---|---|
| 2.5th Quantile (90% CI) |
50th Quantile (90% CI) |
97.5th Quantile (90% CI) |
||
| Male (N = 425) | ||||
| 10–13 (N = 50) |
0.4420 (0.0758–0.8082) |
3.7475 (2.8171–4.6779) |
9.6458 (5.3693–13.9223) |
1.4433 |
| 13–14 (N = 123) |
0.4240 (0.2728–0.5752) |
2.9659 (2.1162–3.8155) |
15.3648 (10.3116–20.4180) |
1.3289 |
| 14–15 (N = 112) |
0.6478 (0.4573–0.8383) |
3.2992 (2.6910–3.9074) |
15.9261 (10.0773–21.7750) |
1.3672 |
| 15–16 (N = 109) |
0.6895 (0.5671–0.8118) |
3.2780 (2.5590–3.9970) |
17.9484 (10.8294–25.0673) |
1.3966 |
| 16–18 (N = 31) |
0.4393 (0–1.0586) |
4.8512 (1.9920–7.7104) |
30.0482 (17.1954–42.9010) |
1.4278 |
| Female (N = 484) | ||||
| 10–13 (N = 44) |
0.8702 (0.2860–1.4544) |
3.1455 (2.0366–4.2544) |
23.4905 (11.1470–35.8340) |
1.0509 |
| 13–14 (N = 127) |
0.4189 (0.3221–0.5158) |
2.0849 (1.5707–2.5992) |
17.2057 (8.81067–25.6007) |
0.9758 |
| 14–15 (N = 142) |
0.7530 (0.4495–1.0566) |
3.1281 (2.6457–3.6104) |
13.5191 (6.8249–20.2134) |
0.9903 |
| 15–16 (N = 131) |
0.5727 (0.1730–0.9723) |
2.9841 (2.6099–3.3584) |
20.0642 (15.1797–24.9487) |
0.4869 |
| 16–18 (N = 40) |
1.1261 (1.0624–1.1898) |
3.4958 (2.8220–4.1696) |
38.9910 (33.3216–44.6603) |
0.2908 |