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Table 1 Baseline characteristics stratified by SUA level

From: The association of low serum uric acid with mortality in older people is modified by kidney function: National Health and Nutrition Examination Survey (NHANES) 1999–2018

Characteristicsan

All

SUA, mg/dLb

2 to < 5

(n = 4607)

5 to < 7

(n = 6990)

 ≥ 7

(n = 2408)

Age, yr

69.8 (0.1)

69.5 (0.1)

69.8 (0.1)

70.7 (0.2)

Female, n (%)

7181 (51.3)

3200 (74.9)

3153 (48.9)

828 (37.5)

Race, n (%)

 White

7278 (52)

2354 (79.9)

3690 (80.3)

1234 (77.8)

 Black

2537 (18.1)

628 ( 5.9)

1268 ( 7.7)

641 (11.6)

 Mexican American

2203 (15.7)

895 (4.9)

1046 (3.7)

262 (3.0)

 Other

1987 (14.2)

730 (9.3)

986 (8.3)

271 (7.6)

Education, n (%)

 Low than high school

4750 (33.9)

1608 (20.8)

2316 (21.0)

826 (24.6)

 High school

3315 (23.7)

1061 (25.9)

1679 (26.4)

575 (25.4)

 College

5940 (42.4)

1938 (53.4)

2995 (52.5)

1007 (50.0)

Smoke, n (%)

 Never

6869 (49.1)

2553 (54.3)

3331 (48.4)

985 (40.4)

 Former

5343 (38.2)

1441 (33)

2749 (39.7)

1153 (50.3)

 Current

1793 (13)

613 (12.8)

910 (11.9)

270 ( 9.4)

BMI, kg/m2

 < 25

3747 (26.8)

1705 (39.8)

1665 (22.1)

377 (14.9)

 25 to < 30

5318 (38)

1739 (36.2)

2688 (38.8)

891 (35.8)

 ≥ 30

4940 (35.3)

1163 (24)

2637 (39.0)

1140 (49.3)

WBC, cells × 109/L

7.07 (0.0)

6.86 (0.1)

7.09 (0.1)

7.46 (0.1)

Hemoglobin, g/dL

14.10 (0.0)

13.87 (0.0)

14.24 (0.0)

14.17 (0.1)

Serum albumin, g/L

41.99 (0.1)

41.96 (0.1)

42.08 (0.1)

41.79 (0.1)

TCHO, mmol/L

5.15 (0.0)

5.28 (0.0)

5.12 (0.0)

4.98 (0.0)

TG, mmol/L

1.73 (0.0)

1.55 (0.0)

1.76 (0.0)

1.99 (0.0)

UACR, mg/g

48.68 (2.8)

28.96 ( 2.3)

42.42 ( 2.9)

110.51 (13.2)

eGFR, ml/min/1.73m2

73.68 (0.2)

80.13 (0.3)

72.94 (0.3)

62.25 (0.5)

ASCVD risk

0.28 (0.0)

0.30 (0.0)

0.26 (0.0)

0.27 (0.0)

CCI, count

1.65 (0.0)

1.56 (0.0)

1.61 (0.0)

1.98 (0.1)

Hypertension, n (%)

9770 (69.8)

2912 (58.9)

4880 (67.4)

1978 (81.3)

Diabetes, n (%)

4198 (30)

1263 (21.4)

2075 (24.8)

860 (32.5)

CV disease, n (%)

3176 (22.7)

819 (17.0)

1579 (21.8)

778 (32.3)

Anti-hypertension, n (%)

7164 (51.2)

1893 (40.3)

3560 (50.1)

1711 (70.7)

Lipid-lowering drugs, n (%)

5274 (37.7)

1594 (36)

2684 (41)

996 (44.0)

Hypoglycemic, n (%)

2741 (19.6)

846 (14.0)

1335 (15.8)

560 (21.9)

Urate-lowing agents, n (%)

170 (1.2)

50 (1.2)

85 (1.1)

35 (1.3)

  1. Abbreviations: SUA serum uric acid, BMI body mass index, TCHO total cholesterol, TG triglycerides, UACR urine albumin to creatinine ratio, eGFR estimated glomerular filtration rate, CKD chronic kidney disease, CV cardiovascular, ASCVD atherosclerotic cardiovascular disease, CCI Charlson Comorbidity Index
  2. aAll estimates accounted for complex survey designs. Continuous variables were expressed as mean (standard error). Categorical variables were expressed as number (percent)
  3. bAll intervals are left closed and right open