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Table 1 Patient characteristics by baseline Magnesium level

From: Serum magnesium, mortality and disease progression in chronic kidney disease

Factor

Overall (N = 10,568)

< 1.7 mg/dl (N = 1314)

1.7–2.6 mg/dl (N = 9049)

> 2.6 mg/dl (N = 205)

p-value

Age

68.7 ± 13.3

65.4 ± 13.5

69.1 ± 13.2

68.7 ± 14.0

< 0.001a

Male

4969 (47.0)

556 (42.3)

4309 (47.6)

104 (50.7)

< 0.001c

African American

1445 (13.7)

188 (14.3)

1222 (13.5)

35 (17.1)

0.26c

Smoking

    

0.005c

 No

7414 (70.2)

884 (67.3)

6386 (70.6)

144 (70.2)

 

 Yes

723 (6.8)

122 (9.3)

588 (6.5)

13 (6.3)

 

 Missing

2431 (23.0)

308 (23.4)

2075 (22.9)

48 (23.4)

 

BMI

29.2 ± 7.0

29.2 ± 7.1

29.2 ± 6.9

28.8 ± 8.0

0.80a

BMI group

    

0.20c

  < 18.5 kg/m2

204 (1.9)

33 (2.5)

161 (1.8)

10 (4.9)

 

 18.5–24.9 kg/m2

2719 (25.7)

324 (24.7)

2343 (25.9)

52 (25.4)

 

 25–29.9 kg/m2

3291 (31.1)

409 (31.1)

2823 (31.2)

59 (28.8)

 

 30–34.9 kg/m2

2097 (19.8)

257 (19.6)

1801 (19.9)

39 (19.0)

 

 35–39.9 kg/m2

969 (9.2)

119 (9.1)

833 (9.2)

17 (8.3)

 

 40+ kg/m2

757 (7.2)

101 (7.7)

641 (7.1)

15 (7.3)

 

 Missing

531 (5.0)

71 (5.4)

447 (4.9)

13 (6.3)

 

Diabetes

2175 (20.6)

316 (24.0)

1809 (20.0)

50 (24.4)

0.001c

Malignancy

2871 (27.2)

428 (32.6)

2405 (26.6)

38 (18.5)

< 0.001c

Hypertension

7998 (75.7)

1007 (76.6)

6835 (75.5)

156 (76.1)

0.68c

Hyperlipidemia

7303 (69.1)

849 (64.6)

6307 (69.7)

147 (71.7)

< 0.001c

CAD

2117 (20.0)

190 (14.5)

1875 (20.7)

52 (25.4)

< 0.001c

CHF

1589 (15.0)

107 (8.1)

1408 (15.6)

74 (36.1)

< 0.001c

CVD

894 (8.5)

83 (6.3)

796 (8.8)

15 (7.3)

0.009c

PVD

279 (2.6)

30 (2.3)

244 (2.7)

5 (2.4)

0.67c

ACEI/ARB

6025 (57.0)

688 (52.4)

5207 (57.5)

130 (63.4)

< 0.001c

Diuretics

6684 (63.2)

816 (62.1)

5715 (63.2)

153 (74.6)

0.002c

Statin

5138 (48.6)

578 (44.0)

4456 (49.2)

104 (50.7)

0.001c

Beta Blocker

5963 (56.4)

722 (54.9)

5113 (56.5)

128 (62.4)

0.12c

Magnesium supplement

2572 (24.3)

525 (40.0)

2012 (22.2)

35 (17.1)

< 0.001c

Proton pump inhibitor

5236 (49.5)

754 (57.4)

4390 (48.5)

92 (44.9)

< 0.001c

eGFR

46.3 ± 11.0

46.7 ± 10.4

46.3 ± 11.0

40.0 ± 12.9

< 0.001a

CKD stage

    

< 0.001c

 45–59

6572 (62.2)

834 (63.5)

5652 (62.5)

86 (42.0)

 

 30–44

2888 (27.3)

367 (27.9)

2461 (27.2)

60 (29.3)

 

 15–29

1108 (10.5)

113 (8.6)

936 (10.3)

59 (28.8)

 

Albumin

3.9 ± 0.59

3.8 ± 0.62

3.9 ± 0.59

3.9 ± 0.61

< 0.001a

Hemoglobin

12.3 ± 1.9

11.7 ± 1.9

12.4 ± 1.9

11.7 ± 2.2

< 0.001a

Potassium

4.3 ± 0.59

4.2 ± 0.64

4.3 ± 0.58

4.4 ± 0.64

< 0.001a

Calcium

9.4 ± 0.68

9.3 ± 0.76

9.4 ± 0.66

9.3 ± 0.86

< 0.001a

CO2

25.8 ± 3.8

25.0 ± 4.0

26.0 ± 3.7

26.3 ± 5.4

< 0.001a

Insurance grouped

    

0.035c

 Medicaid

241 (2.3)

33 (2.5)

204 (2.3)

4 (2.0)

 

 Medicare

6901 (65.3)

821 (62.5)

5942 (65.7)

138 (67.3)

 

 Other

2835 (26.8)

367 (27.9)

2422 (26.8)

46 (22.4)

 

 Missing

591 (5.6)

93 (7.1)

481 (5.3)

17 (8.3)

 
  1. Statistics presented as Mean ± SD, or N (column %)
  2. p-values: aANOVA, cPearson’s chi-square test
  3. Number missing data: BMI 531, albumin 544, hemoglobin 529, potassium 6, calcium 5, CO2 6