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Table 1 Demographics of patients, N = 13868

From: Survival prognosis after the start of a renal replacement therapy in the Netherlands: a retrospective cohort study

Patients starting a renal replacement therapy in 1995–2005, ≥16 years of age, with a registered primary renal disease and peritoneal dialysis, hemodialysis or a functioning kidney transplant at 90 days after the start

Total N = 13868 %

Development group N = 6934 %

Validation group N = 6934 %

P-value

  

%

   

Sex

Male

60.2

61.1

59.4

0.04

Age group

16-44 year

17.1

17.6

16.7

0.47

 

45-64 year

36.9

36.9

36.9

 
 

65-74 year

28.4

28.4

28.4

 
 

75 year or older

17.6

17.2

17.9

 

Primary renal disease

Diabetes

16.7

16.6

16.8

0.71

 

Renal vascular disease

25.3

25.2

25.3

 
 

Glomerulonephritis

12.3

12.5

12.1

 
 

Cystic kidney disease

9.0

8.8

9.2

 
 

Other diseases*

21.4

21.8

21.0

 
 

Unknown**

15.2

14.9

15.5

 

Start year renal replacement

1995 – 2000

50.3

50.9

49.6

0.15

2001 – 2005

49.7

49.1

50.4

Therapy at baseline

Transplantation

3.0

2.8

3.2

0.32

 

Hemodialysis

65.7

65.5

65.9

 
 

Peritoneal dialysis

31.3

31.7

31

 
  1. *The group “other diseases” consists of the subcategories interstitial nephritis (9.4%), other congenital and hereditary kidney diseases (1.5%), other multisystem diseases (5.4%) and other primary renal diseases (5.1%).
  2. **The primary kidney disease “unknown” is included as a separate category in the prognosis, as these are probably shrunken kidneys, whereby it was no longer possible to determine the original disease. This is a specific recognisable category of patients, and therefore this is a separate diagnosis in the prognostic formula.