Age
n
2.5 %
50.0 %
97.5 %
3–5 months
18
0.14
0.20
0.26
6–8 months
19
0.14
0.22
0.31
9–11 months
31
0.14
0.22
0.34
1 year
70
0.16
0.23
0.32
2 years
73
0.17
0.24
0.37
3 years
88
0.21
0.27
0.37
4 years
81
0.20
0.30
0.40
5 years
96
0.25
0.34
0.45
6 years
102
0.25
0.34
0.48
7 years
85
0.28
0.37
0.49
8 years
56
0.29
0.40
0.53
9 years
36
0.34
0.41
0.51
10 years
44
0.30
0.41
0.57
11 years
58
0.35
0.45
0.58
Table 2
Between 12 and 16 years old in males and females. Reference values of serum creatinine in Japanese adolescents
Sex
|
Males
|
Females
|
||||||
---|---|---|---|---|---|---|---|---|
Age
|
n
|
2.5 %
|
50.0 %
|
97.5 %
|
N
|
2.5 %
|
50.0 %
|
97.5 %
|
12 years
|
15
|
0.40
|
0.53
|
0.61
|
54
|
0.40
|
0.52
|
0.66
|
13 years
|
30
|
0.42
|
0.59
|
0.80
|
38
|
0.41
|
0.53
|
0.69
|
14 years
|
17
|
0.54
|
0.65
|
0.96
|
40
|
0.46
|
0.58
|
0.71
|
15 years
|
15
|
0.48
|
0.68
|
0.93
|
22
|
0.47
|
0.56
|
0.72
|
16 years
|
30
|
0.62
|
0.73
|
0.96
|
27
|
0.51
|
0.59
|
0.74
|
eGFR (mL/min/1.73 m2) = 110.2 × (reference serum Cr/patient’s serum Cr) + 2.93
Reference serum Cr levels (Cr (mg/dL)) are shown by the following two equations of body length (Ht (m)):
Male patients: Cr = −1.259 Ht5 + 7.815 Ht4 – 18.57 Ht3 + 21.39 Ht2 – 11.71 Ht + 2.628
Female patients: Cr = −4.536 Ht5 + 27.16 Ht4 – 63.47 Ht3 + 72.43 Ht2 – 40.06 Ht + 8.778
A simple serum Cr-based eGFR formula for bedside use was also determined for Japanese children between the ages of 2 and 11 years ([6], PMID: 23564380):
eGFR (mL/min/1.73 m2) = 0.35 × Ht/Cr × 100
The Committee also reported reference values for serum cystatin C levels ([7], PMID: 23446519), a cystatin C-based equation for eGFR in Japanese children and adolescents ([8], PMID: 24253614), and reference values for serum β2 microglobulin (Table 3) ([9], PMID: 22797889).
Table 3
Reference values of serum β2 microglobulin levels in Japanese children
All subjects
|
Boys
|
Girls
|
||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Age
|
n
|
2.5 %
|
50 %
|
97.5 %
|
n
|
2.5 %
|
50 %
|
97.5 %
|
n
|
2.5 %
|
50 %
|
97.5 %
|
3–5 months
|
21
|
1.5
|
1.8
|
3.2
|
17
|
1.5
|
1.8
|
3.2
|
4
|
1.6
|
1.8
|
2.1
|
6–8 months
|
18
|
1.4
|
1.8
|
2.6
|
14
|
1.4
|
1.9
|
2.6
|
4
|
1.6
|
1.6
|
2.3
|
9–11 months
|
29
|
1.3
|
1.7
|
3.3
|
15
|
1.3
|
1.7
|
3.3
|
14
|
1.3
|
1.8
|
3.2
|
1 year
|
69
|
1.4
|
1.7
|
3.1
|
32
|
1.4
|
1.7
|
3.2
|
37
|
1.2
|
1.6
|
3.0
|
2 years
|
73
|
1.0
|
1.5
|
2.5
|
40
|
1.0
|
1.5
|
2.2
|
33
|
1.0
|
1.5
|
3.4
|
3 years
|
85
|
1.0
|
1.5
|
2.3
|
46
|
1.1
|
1.5
|
2.3
|
39
|
1.0
|
1.5
|
2.4
|
4 years
|
78
|
1.1
|
1.4
|
2.5
|
42
|
1.0
|
1.4
|
2.1
|
36
|
1.1
|
1.4
|
3.1
|
5 years
|
94
|
1.1
|
1.4
|
2.3
|
46
|
1.1
|
1.5
|
2.7
|
48
|
1.0
|
1.4
|
2.2
|
6 years
|
101
|
1.1
|
1.4
|
2.3
|
43
|
1.1
|
1.4
|
2.4
|
58
|
1.0
|
1.5
|
2.3
|
7 years
|
83
|
1.0
|
1.4
|
2.1
|
36
|
0.9
|
1.3
|
2.1
|
47
|
1.0
|
1.4
|
2.2
|
8 years
|
55
|
1.0
|
1.4
|
2.5
|
19
|
1.0
|
1.4
|
1.8
|
36
|
1.0
|
1.4
|
2.3
|
9 years
|
37
|
1.0
|
1.4
|
2.1
|
18
|
1.1
|
1.4
|
1.8
|
19
|
1.0
|
1.4
|
2.1
|
10 years
|
42
|
0.9
|
1.3
|
1.9
|
11
|
1.1
|
1.4
|
1.6
|
31
|
0.9
|
1.3
|
1.9
|
11 years
|
58
|
1.0
|
1.3
|
2.3
|
19
|
1.1
|
1.3
|
2.1
|
39
|
1.0
|
1.2
|
2.4
|
12 years
|
69
|
1.0
|
1.3
|
1.8
|
14
|
1.2
|
1.3
|
1.5
|
55
|
0.9
|
1.3
|
1.9
|
13 years
|
68
|
1.0
|
1.3
|
1.8
|
30
|
1.0
|
1.4
|
2.0
|
38
|
1.0
|
1.2
|
1.5
|
14 years
|
57
|
0.9
|
1.3
|
2.0
|
17
|
1.1
|
1.4
|
2.0
|
40
|
0.9
|
1.2
|
1.7
|
15 years
|
35
|
0.8
|
1.2
|
1.8
|
15
|
0.8
|
1.2
|
1.8
|
20
|
0.8
|
1.1
|
1.7
|
16 years
|
59
|
0.8
|
1.2
|
1.8
|
30
|
0.8
|
1.2
|
1.8
|
29
|
0.8
|
1.1
|
1.4
|
All ages
|
1,311
|
1.0
|
1.4
|
2.3
|
504
|
1.0
|
1.4
|
2.3
|
627
|