Table 2 Baseline categorical variable values

 Male

17 (65.3)

8 (57.1)

9 (75.0)

 Female

9 (34.6)

6 (42.8)

3 (25.0)

0.429

 Smoker

7 (27.0)

5 (35.7)

2 (16.7)

 Ex-smoker

14 (53.8)

5 (35.7)

9 (75.0)

 Non-smoker

5 (19.2)

4 (28.6)

1 (8.3)

N/A

 3b

3 (11.5)

1 (7.1)

2 (16.7)

 4

16 (61.5)

9 (64.3)

7 (58.3)

 5

7 (26.9)

4 (28.6)

3 (25.0)

N/A

 White

26 (100.0)

14 (100.0)

12 (100.)

 Black

0 (0.0)

0 (0.0)

0 (0.0)

 Other

0 (0.0)

0 (0.0)

0 (0.0)

N/A

 Hypertension

21 (80.8)

13 (92.9)

8 (66.7)

0.148

 Type I Diabetes Mellitus

2 (7.7)

2 (14.3)

0 (0.0)

0.483

 Type II Diabetes Mellitus

11 (42.3)

6 (42.8)

5 (41.7)

1.000

 Heart failure

7 (26.9)

1 (7.1)

6 (50.0)

0.0026

 Ischemic Heart disease

10 (38.5)

4 (28.6)

6 (50.0)

0.422

 Previous cancer

5 (19.2)

2 (14.3)

3 (25.0)

0.635

 Erythropoiesis stimulating agents

8 (30.8)

5 (35.7)

3 (25.0)

0.683

 Renin-angiotensin-aldosterone system associated medications

16 (61.5)

9 (64.3)

7 (58.3)

1.000

 Vitamin D supplementation

6 (23.1)

4 (28.6)

2 (16.7)

0.652

 Diuretics

14 (53.8)

7 (50.0)

7 (58.3)

0.713

 ß-blockers

18 (69.2)

9 (64.3)

9 (75.0)

0.683

Cause

 Autosomal Dominant Polycystic Kidney Disease

1 (3.8)

1 (7.1)

0 (0.0)

N/A

 Multifactorial

6 (23.1)

2 (14.3)

4 (33.3)

N/A

 Primary renovascular

2 (7.7)

1 (7.1)

1 (8.3)

N/A

 Glomerulosclerosis

1 (3.8)

0 (0.0)

1 (8.3)

N/A

 Unknown

1 (3.8)

1 (7.1)

0 (0.0)

N/A

 Diabetic nephropathy

3 (11.5)

2 (14.3)

1 (8.3)

N/A

 IgA nephropathy

2 (7.7)

1 (7.1)

1 (8.3)

N/A

 Nephrectomy

1 (3.8)

0 (0.0)

1 (8.3)

N/A

 Kidney aplasia and obstructive uropathy

1 (3.8)

1 (7.1)

0 (0.0)

N/A

 Chronic pyelonephritis

1 (3.8)

1 (7.1)

0 (0.0)

N/A

 Membranous nephropathy

3 (11.5)

3 (21.4)

0 (0.0)

N/A

 Cardiorenal syndrome

2 (7.7)

0 (0.0)

2 (16.7)

N/A

 Hypertension

1 (3.8)

1 (7.1)

0 (0.0)

N/A

 Systemic Lupus Erythematosus

1 (3.8)

0 (0.0)

1 (8.3)

N/A