Table 2 Baseline characteristics of male subjects with quintiles of basal uric acid levels (n = 4,454)

From: U-shaped relationship between serum uric acid level and decline in renal function during a 10-year period in female subjects: BOREAS-CKD2

Quintiles of uric acid levels

Q1

Q2

Q3

Q4

Q5

P

(Range of uric acid, mg/dL)

(0.6–5.1)

(5.2–5.7)

(5.8–6.3)

(6.4–6.9)

(7.0–10.4)

n

884

807

943

819

1,001

 

Age (years)

46 ± 9

46 ± 9

45 ± 9

45 ± 9

45 ± 8

0.002

Body mass index

23.1 ± 3.1

23.3 ± 2.9

23.7 ± 3.1

24.2 ± 3.3

25.2 ± 3.5

<0.001

Systolic blood pressure (mmHg)

116 ± 15

118 ± 16

117 ± 15

119 ± 15

120 ± 15

<0.001

Diastolic blood pressure (mmHg)

74 ± 11

76 ± 11

76 ± 11

77 ± 11

79 ± 11

<0.001

Brinkman index

100 (0–7920)

105 (0–3200)

80 (0–3200)

70 (0–2520)

160 (0–5100)

0.443

Alcohol drinking habit

273 (30.9)

275 (34.1)

345 (36.6)

309 (37.7)

404 (40.4)

<0.001

Medications

  Anti-hypertensive drugs

61 (6.9)

64 (7.9)

71 (7.5)

66 (8.1)

94 (9.4)

0.357

  Anti-diabetic drugs

53 (6.0)

25 (3.1)

26 (2.8)

16 (2.0)

24 (2.4)

<0.001

  Anti-dyslipidemic drugs

27 (3.1)

20 (2.5)

28 (3.0)

27 (3.3)

28 (2.8)

0.892

Regular exercise

     

<0.001

  Mild

594 (71.3)

510 (67.2)

673 (74.9)

580 (74.6)

737 (78.0)

 

  Moderate

171 (20.5)

175 (23.1)

171 (19.0)

157 (20.2)

170 (18.0)

 

  Severe

68 (8.2)

74 (9.7)

54 (6.0)

41 (5.3)

38 (4.0)

 

Biochemistry

  AST (IU/L)

21 (10–76)

21 (10–108)

22 (11–142)

23 (11–126)

25 (13–136)

<0.001

  ALT (IU/L)

22 (7–268)

23 (8–188)

25 (3–176)

27 (7–274)

31 (6–260)

<0.001

  γGTP (IU/L)

32 (11–626)

35 (9–726)

39 (11–1328)

44 (13–522)

55 (14–1111)

<0.001

  Blood urea nitrogen (mg/dL)

14 ± 3

14 ± 3

14 ± 3

15 ± 3

15 ± 3

0.021

  Creatinine (mg/dL)

0.76 ± 0.10

0.77 ± 0.10

0.79 ± 0.10

0.80 ± 0.10

0.83 ± 0.10

<0.001

  eGFR (mL/min/1.73 m2)

89.3 ± 13.1

87.8 ± 12.8

86.0 ± 13.1

85.0 ± 12.7

82.5 ± 12.6

<0.001

  Uric acid (mg/dL)

4.5 ± 0.7

5.5 ± 0.2

6.1 ± 0.2

6.6 ± 0.2

7.7 ± 0.7

<0.001

  Total cholesterol (mg/dL)

198 ± 32

201 ± 32

203 ± 31

205 ± 33

212 ± 34

<0.001

  LDL cholesterol (mg/dL)

119 ± 30

121 ± 30

123 ± 30

122 ± 32

126 ± 33

<0.001

  HDL cholesterol (mg/dL)

58 ± 15

56 ± 13

56 ± 14

56 ± 14

53 ± 14

<0.001

  Triglycerides (mg/dL)

91 (19–687)

99 (26–771)

105 (24–862)

111 (27–679)

135 (35–1931)

<0.001

  Fasting glucose (mg/dL)

96 ± 24

94 ± 20

93 ± 15

93 ± 15

94 ± 15

0.002

  Hemoglobin A1c (%)

5.1 ± 0.9

5.0 ± 0.7

5.0 ± 0.6

5.0 ± 0.6

4.9 ± 0.5

0.003

  Hemoglobin (g/dL)

15.0 ± 1.0

15.2 ± 1.0

15.2 ± 1.0

15.2 ± 1.1

15.4 ± 1.1

<0.001

  Albumin (g/dL)

4.4 ± 0.2

4.4 ± 0.2

4.4 ± 0.2

4.5 ± 0.2

4.5 ± 0.2

<0.001

  Proteinuria (Qualitative)

32 (3.6)

28 (3.5)

31 (3.3)

23 (2.8)

49 (4.9)

0.166

  1. Variables are expressed as number (%), means ± SD or medians (interquartile ranges)
  2. Brinkman index was obtained by multiplication of the average number of cigarettes smoked a day and smoking years
  3. AST aspartate transaminase, ALT alanine transaminase, eGFR estimated glomerular filtration rate, γGTP γ-glutamyl transpeptidase