Table 3 Age- and sex-partitioned RIs for serum Crea and Cys C.

From: Updated reference intervals for serum cystatin C and creatinine based on age and sex variations

Age

Male

Female

2.5th (95% CI)

97.5th (95% CI)

n

2.5th (95% CI)

97.5th (95% CI)

n

Cys C (Old non-partitioned by age and sex RI: 0.51 to 1.09 mg/L)

≤ 18

0.68 (0.68 to 0.74)

1.04 (1.00 to 1.16)

6

0.66 (0.68 to 0.74)

1.03 (1.05 to 1.21)

25

18–30

0.64 (0.66 to 0.68)

1.01 (1.03 to 1.08)

1041

0.56 (0.58 to 0.59)

0.92 (0.94 to 0.97)

2778

31–40

0.62 (0.64 to 0.66)

1.02 (1.05 to 1.08)

1424

0.53 (0.55 to 0.56)

0.89 (0.92 to 0.93)

3447

41–50

0.63 (0.65 to 0.67)

1.07 (1.10 to 1.13)

958

0.54 (0.57 to 0.58)

0.93 (0.96 to 0.98)

2222

51–60

0.65 (0.68 to 0.70)

1.15 (1.18 to 1.23)

814

0.58 (0.61 to 0.62)

1.02 (1.05 to 1.08)

1387

61–70

0.68 (0.72 to 0.74)

1.26 (1.28 to 1.37)

305

0.64 (0.67 to 0.69)

1.15 (1.17 to 1.23)

372

≥ 71

0.72 (0.76 to 0.85)

1.46 (1.42 to 1.84)

94

0.75 (0.76 to 0.85)

1.40 (1.34 to 1.63)

95

Crea (old RIs: age 20–60 years, Male: 57–97 µmol/L, Female: 41–73µmol/L; age > 60 years, Male: 57–111 µmol/L; Female: 41–88 µmol/L)

≤ 18

51.7 (50.6 to 56.3)

87.9 (84.0 to 96.0)

6

38.7 (37.9 to 42.2)

67.2 (65.1 to 72.3)

25

18–50

55.3 (56.1 to 57.8)

94.0 (94.3 to 97.2)

3423

38.32 (39.3 to 40.2)

68.4 (69.2 to 70.7)

8447

51–70

46.0 (46.5 to 48.9)

82.4 (94.3 to 97.2)

1772

37.92 (38.9 to 40.1)

70.3 (71.0 to 73.2)

1795

≥ 71

51.9 (50.4 to 58.1)

98.6 (95.6 to 107.6)

94

40.52 (39.0 to 45.4)

76.6 (74.4 to 84.9)

95

  1. Values represent non-parametric RIs and 95% CIs partitioned by age and sex. n denotes the number of samples per partition.