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Table 1 Prevalence of proteinuria, estimated glomerular filtration rates, and chronic kidney disease severity in middle-aged male and female Japanese workers

From: Distribution of and factors contributing to chronic kidney disease in a middle-aged working population

Chronic kidney disease signs

35–44 years

45–54 years

55–64 years

Total

Male (n = 1,204)

Female (n = 630)

Male (n = 1,559)

Female (n = 1,232)

Male (n = 1,201)

Female (n = 836)

Male (n = 3,964)

Female (n = 2,698)

Proteinuria (dipstick measurement)a

 1+

1.7

0.8

1.6

1.2

2.3

0.7

1.9

1.0

 ≥2+

0.6

0.0

0.9

0.2

1.5

0.1

1.0

0.1

eGFR (mL/min/1.73 m2)b

 G1: ≥90

8.2

13.8

3.4

5.5

3.6

2.4

4.9

6.5

 G2: 60–89

85.7

80.2

82.3

79.0

74.2

75.0

80.9

78.0

 G3a: 45–59

5.7

6.0

13.8

15.5

21.0

22.0

13.5

15.3

 G3b: 30–44

0.1

0.0

0.4

0.0

1.0

0.5

0.5

0.1

 G4: 15–29

0.0

0.0

0.1

0.0

0.1

0.1

0.1

<0.1

 G5: ≤14

0.2

0.0

0.1

0.0

0.2

0.0

0.2

0.0

CKD severity (mL/min/1.73 m2)b

 Mild

7.0

6.5

14.0

15.5

21.0

22.2

14.0

15.5

 Moderate

0.6

0.2

1.3

0.6

2.3

0.6

1.4

0.5

 Severe

0.3

0.0

0.5

0.1

1.0

0.2

0.6

0.1

  1. eGFR estimated glomerular filtration rate based on serum creatinine (Cr) level, CKD chronic kidney disease
  2. Data are presented as the prevalence (%) of each variable
  3. aDipstick measurement: 1+, mild proteinuria (A2), ≥2+, marked proteinuria (A3) categories
  4. bFor the definitions/units of eGFR levels and CKD severity, see text (Determinations of CKD severity)