Table 1 The findings of Chi-square tests of the demographic variables by race (weighted), n = 1864

Weighted sample size

22,763,252

84.5

4,161,779

15.5

< 0.0001

Sex

0.68

 Female

13,099,718

57.5

2,342,614

56.3

 Male

9,663,534

42.4

1,819,166

43.7

Age

< 0.0001

 ≤ 24

811,647

3.6

251,255

6

 25–44

2,549,468

11.2

1,336,418

32.1

 45–64

6,149,249

27

1,383,527

33.2

 ≥ 65

13,252,887

58.2

1,190,579

28.6

Education

< 0.0001

 High school or less

8,920,097

39.2

280,427

67.5

 More than high school

13,826,468

60.8

135,111

32.5

Annual household income

< 0.0001

 ≥ 75 K

800,742

36.2

687,686

18.8

 < 75 K

14,087,371

63.8

2,976,173

81.2

Awareness of CKD status

0.86

 Aware

2,411,105

10.7

452,802

10.9

 Unaware

20,217,434

89.3

3,699,568

89.1

CKD stages

< 0.0001

 Stage-1

5,677,111

24.9

237,046

57

 Stage-2

4,649,478

20.4

708,100

17

 Stage-3

11,749,861

51.6

901,093

21.7

 Stage-4

512,842

2.3

132,608

3.2

 Stage-5

173,960

0.8

49,517

1.2