Table 1 Description of 7514 participants included in the present study.

From: Serum uric acid is inversely associated with lung function in US adults

Characteristic

All(n = 7514)

Tertile of serum uric acid (mg/dl)

P value

Tertile 1 (< 4.70) (n = 2498)

Tertile 2 (4.70–5.70) (n = 2322)

Tertile 3 (> 5.70) (n = 2694)

Age (years)

40.85 ± 14.28

40.26 ± 13.76

41.12 ± 14.77

41.15 ± 14.32

0.0418

Gender, n (%)

< 0.0001

 Male

3690 (49.11)

366 (14.66)

1132 (48.77)

2152 (79.88)

 

 Female

3824 (50.89)

2132 (85.34)

1190 (51.23)

542 (20.12)

 

Race, n (%)

0.0098

 Mexican American

732 (9.74)

243 (9.73)

242 (10.43)

248 (9.21)

 

 Other Hispanic

458 (6.09)

177 (7.07)

152 (6.54)

131 (4.85)

 

 Non-Hispanic White

5009 (66.66)

1650 (66.05)

1496 (64.42)

1858 (68.97)

 

 Non-Hispanic Black

793 (10.55)

261 (10.46)

261 (11.25)

271 (10.07)

 

 Other Race

524 (6.97)

167 (6.69)

171 (7.36)

186 (6.90)

 

Income-poverty ratio, n (%)

0.0081

 Poor

1530 (20.36)

522 (20.89)

523 (22.54)

489 (18.17)

 

 Nearly poor

606 (8.06)

189 (7.56)

191 (8.22)

226 (8.38)

 

 Not poor

4929 (65.60)

1643 (65.76)

1464 (63.04)

1818 (67.47)

 

 Missing

449 (5.98)

145 (5.79)

144 (6.19)

161 (5.98)

 

Smoke, n (%)

< 0.0001

 Yes

2888 (38.44)

879 (35.19)

902 (38.83)

1105 (41.01)

 

 No

4449 (59.21)

1566 (62.71)

1352 (58.23)

1533 (56.89)

 

 Missing

177 (2.35)

52 (2.10)

68 (2.94)

57 (2.10)

 

Alcohol drinking, n (%)

< 0.0001

 Yes

5620 (74.80)

1751 (70.10)

1708 (73.57)

2153 (79.93)

 

 No

1319 (17.56)

521 (20.86)

444 (19.11)

361 (13.40)

 

 Missing

574 (7.64)

226 (9.04)

170 (7.31)

180 (6.67)

 

Body Mass Index (kg/m2)

28.18 ± 6.30

25.94 ± 5.44

28.31 ± 6.13

30.08 ± 6.49

< 0.0001

SBP (mmHg)

119.34 ± 14.65

116.06 ± 14.79

119.54 ± 14.41

122.09 ± 14.12

< 0.0001

DBP (mmHg)

71.26 ± 11.26

69.76 ± 10.67

70.75 ± 10.88

73.00 ± 11.82

< 0.0001

Calcium (mg/dL)

9.42 ± 0.34

9.36 ± 0.34

9.43 ± 0.34

9.47 ± 0.34

< 0.0001

Total bilirubin (mg/dL)

0.77 ± 0.30

0.69 ± 0.26

0.75 ± 0.29

0.85 ± 0.33

< 0.0001

Total Protein (g/dL)

7.15 ± 0.44

7.08 ± 0.45

7.15 ± 0.43

7.21 ± 0.43

< 0.0001

Total cholesterol (mg/dL)

196.51 ± 39.49

194.20 ± 39.26

194.05 ± 39.30

200.50 ± 39.50

< 0.0001

Creatinine (mg/dL)

0.85 ± 0.18

0.74 ± 0.15

0.85 ± 0.16

0.95 ± 0.17

< 0.0001

Blood urea nitrogen (mg/dL)

12.30 ± 4.01

11.24 ± 3.62

12.34 ± 4.07

13.20 ± 4.06

< 0.0001

Serum UA (mg/dl)

5.34 ± 1.34

3.91 ± 0.54

5.19 ± 0.32

6.73 ± 0.82

< 0.0001

FeNO (ppb)

13.50 (9.00–19.50)

12.50 (8.50–17.50)

13.50 (9.00–19.50)

14.00 (9.50–20.50)

< 0.001

FVC (ml)

4248.72 ± 1054.30

3816.56 ± 818.60

4206.57 ± 1090.78

4664.66 ± 1049.27

< 0.0001

FEV1 (ml)

3436.98 ± 863.91

3113.14 ± 679.10

3399.32 ± 898.03

3753.45 ± 870.25

< 0.0001

  1. Data are presented as n (%), means ± SD or medians (25th percentile-75th percentile). BMI: body mass index; SBP: Systolic blood pressure; DBP: Diastolic blood pressure; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; UA: uric acid; FeNO: fractional exhaled nitric oxide.