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Table 2 Summary statistics of eGFRs from a series of two-year moving intervals

From: Variability in estimated glomerular filtration rate values is a risk factor in chronic kidney disease progression among patients with diabetes

CKD stage

Early 3

Late 3

Stage 4

Two-year moving interval

       
  

(−1,0)

(0,1)

(1,2)

(2,3)

(3,4)

All

(−1,0)

(0,1)

(1,2)

(2,3)

(3,4)

All

(−1,0)

(0,1)

(1,2)

(2,3)

(3,4)

All

eGFR

                   

Variables

                   

Variability

median

6.0

6.2

5.7

5.3

5.3

5.8

5.5

5.7

4.8

4.4

4.4

5.1

4.6

4.6

3.4

3.1

3.2

4.0

(SD)

Q1

3.8

4.4

4.1

3.7

3.6

4.0

3.5

3.8

3.4

3.0

2.9

3.4

2.8

3.0

2.4

2.0

2.1

2.6

 

Q3

8.6

8.6

7.7

7.5

7.6

8.1

8.8

8.4

6.8

6.2

6.3

7.5

7.9

7.1

5.0

4.6

4.8

6.5

 

IQR

4.8

4.2

3.6

3.8

4.0

4.1

5.3

4.6

3.4

3.2

3.4

4.1

5.1

4.1

2.6

2.6

2.7

3.9

Mean

median

56.4

55.0

52.8

52

49.9

54.1

43.4

41.7

39.3

38.8

37.6

41.0

29.0

27.1

25.3

25.7

25.8

27.2

 

Q1

51.9

50.5

47.7

45.8

43.3

48.8

38.5

37.0

34.3

33.0

31.3

35.7

24.6

22.9

20.8

20.9

20.7

22.7

 

Q3

60.9

59.2

57.6

58

56.7

59.1

48.7

46.5

44.2

44.8

44.2

46.3

34.2

31.4

29.7

31.1

31.8

32.2

 

IQR

9.0

8.7

9.9

12.2

13.4

10.3

10.2

9.5

9.9

11.8

12.9

10.6

9.6

8.5

8.9

10.2

11.1

9.5

Coefficient of variation

median

10.7

11.4

10.8

10.4

10.9

10.9

13.1

13.8

12.5

11.5

11.8

12.8

16.3

17.5

14.5

12.4

12.7

15.4

 

Q1

7.1

8.2

7.7

7.1

7.2

7.5

8.7

9.7

8.8

7.8

8.0

8.7

10.9

12.0

10.1

8.5

8.6

10.5

 

Q3

14.9

15.6

14.9

14.8

15.7

15.1

18.9

19.4

17.4

16.3

17.2

18.1

24.3

25.1

20.2

17.6

17.8

22.5

 

IQR

7.8

7.4

7.2

7.7

8.5

7.6

10.2

9.7

8.6

8.5

9.2

9.4

13.4

13.1

10.1

9.1

9.2

12.0

Slope

median

−3.6

−2.7

−1.3

−1.5

−1.2

−2.2

−5.9

−3.7

−1

−1.5

−1.2

−2.8

−6.8

−4.2

−1.1

−1.4

−1.2

−3.5

 

Q1

−9.3

−6.9

−5.1

−5.9

−4.6

−6.6

−13

−8.1

−4.4

−5.2

−4

−7.5

−14

−8.3

−3.7

−3.9

−3.2

−8.2

 

Q3

0.8

0.9

2.7

2.5

2

1.7

−0.8

−0.1

2.7

1.9

1.6

0.8

−2.4

−1.3

1.9

1.2

0.8

−0.3

 

IQR

10.1

7.8

7.8

8.4

6.6

8.3

12.2

8.0

7.1

7.1

5.6

8.3

11.6

7.0

5.6

5.1

4.0

7.9

  1. CKD: Chronic Kidney Disease; For two-year moving interval, 0 denotes the baseline year, −1 denotes the year prior to the baseline, and 1 to 4 denote the number of years in the follow-up period. eGFR: estimated Glomerular Filtration Rate. SD: standard deviation of an individual patient’s repeatedly measured eGFR values from a two-year interval. Q1: 1st quartile. Q3: 3rd quartile. IQR: Inter-Quartile Range (=Q3 minus Q1). The unit for the eGFR slope variable is ml/min/1.73 m2/year.