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Table 1 Characteristics of participants

From: The association between blood manganese and liver stiffness in participants with chronic obstructive pulmonary disease: a cross-sectional study from NHANES 2017–2018

Characteristics

COPD (n = 223)

Non-COPD (n = 4467)

P value

Age (years)

65.05 ± 11.54

50.50 ± 17.39

 < 0.01

Striated by age (years) (%)

  

 < 0.01

  < 60

28.25

63.96

 

  ≥ 60

71.75

36.04

 

Gender (%)

  

0.44

 Male

51.57

48.89

 

 Female

48.43

51.11

 

BMI (kg/m2)

30.01 ± 8.72

29.74 ± 7.14

0.71

Striated by BMI (kg/m2) (%)

  

0.54

  < 28

47.53

45.42

 

  ≥ 28

52.47

54.58

 

Race (%)

  

 < 0.01

 White

70.85

57.09

 

 Black

16.59

23.10

 

 Other race

12.56

19.81

 

PIR (%)

  

 < 0.01

  < 1.39

45.74

25.45

 

 1.39–3.49

32.29

34.03

 

  > 3.49

10.76

27.83

 

 Unclear

11.21

12.69

 

Alcohol drinking (%)

  

0.12

 Yes

11.21

11.06

 

 No

78.48

73.63

 

 Unclear

10.31

15.31

 

Smoker (%)

  

 < 0.01

 Yes

14.80

60.0

 

 No

85.20

40.0

 

Diet status (%)

  

 < 0.01

 Excellent

7.17

7.23

 

 Very good

15.25

20.51

 

 Good

34.98

39.11

 

 Fair

26.91

26.82

 

 Poor

15.70

6.34

 

Diabetes (%)

  

 < 0.01

 Yes

31.84

14.64

 

 No

65.02

82.0

 

 Borderline

3.14

3.29

 

 Unclear

0

0.07

 

Congestive heart failure (%)

  

 < 0.01

 Yes

14.35

1.95

 

 No

84.30

97.90

 

 Unclear

1.35

0.16

 

Liver conditions (%)

  

 < 0.01

 Yes

11.66

5.19

 

 No

87.44

94.52

 

 Unclear

0.90

0.29

 

Prescription medicine used (%)

  

 < 0.01

 Yes

90.58

57.96

 

 No

9.42

41.88

 

 Unclear

0

0.16

 
  1. Mean + SD for continuous variables: P value was calculated by weighted linear regression model. % for Categorical variables: P value as calculated by weighted chi-square test
  2. BMI body mass index, PIR income to poverty ratio