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Table 1 Baseline characteristics of participants stratified by SA tri-sectional quantiles

From: Association between serum albumin and pulmonary function in adolescents: analyses of NHANES 2007–2012

Characteristics

Overall

(N = 3072)

Low

(N = 802)

Middle

(N = 1191)

High

(N = 1079)

P-value

Albumin (g/dL)

4.43 ± 0.32

4.03 ± 0.21

4.40 ± 0.08

4.75 ± 0.16

< 0.001

Age (years)

15.50 ± 2.27

15.54 ± 2.31

15.27 ± 2.28

15.72 ± 2.20

< 0.001

PIR

2.04 ± 1.52

1.89 ± 1.41

2.09 ± 1.54

2.11 ± 1.55

0.018

Gender, (%)

    

< 0.001

Male

52.83

31.42

52.90

68.67

 

Female

47.17

68.58

47.10

31.33

 

Race/ethnicity, (%)

    

< 0.001

Mexican American

23.96

19.08

24.01

27.53

 

Other Hispanic

11.88

12.59

11.67

11.58

 

Non-Hispanic White

29.17

23.07

28.04

34.94

 

Non-Hispanic Black

25.39

38.78

26.11

14.64

 

Other Race

9.60

6.48

10.16

11.31

 

BMI category, (%)

    

< 0.001

Normal weight

65.36

51.00

65.91

75.44

 

Overweight

19.79

21.82

21.49

16.40

 

Obese

14.84

27.18

12.59

8.16

 

Waist (cm)

82.10 ± 14.82

86.92 ± 17.66

81.41 ± 14.22

79.27 ± 12.02

< 0.001

Height (cm)

165.74 ± 9.92

163.30 ± 9.07

165.54 ± 9.93

167.77 ± 10.10

< 0.001

Total calcium (mmol/L)

2.40 ± 0.08

2.35 ± 0.07

2.40 ± 0.07

2.45 ± 0.07

< 0.001

Globulin (g/dL)

2.82 ± 0.37

2.95 ± 0.39

2.81 ± 0.35

2.72 ± 0.35

< 0.001

Creatinine (µmol/L)

64.70 ± 16.72

61.58 ± 18.86

63.97 ± 15.05

67.82 ± 16.26

< 0.001

Cholesterol (mmol/L)

4.09 ± 0.77

4.08 ± 0.84

4.05 ± 0.74

4.12 ± 0.73

0.028

ALT(U/L)

19.73 ± 14.99

18.89 ± 15.20

18.91 ± 11.45

21.26 ± 17.90

< 0.001

Thoracic/abdominal surgery, (%)

    

0.114

Yes

2.51

3.49

2.1

2.22

 

No

97.49

96.51

97.90

97.78

 

Respiratory disease, (%)

    

0.003

Yes

26.46

29.05

25.94

22.24

 

No

73.54

70.95

74.06

77.76

 

Asthma, (%)

    

< 0.001

Yes

19.47

22.82

21.24

15.01

 

No

80.53

77.18

77.76

84.99

 

smoking, (%)

    

0.003

Yes

20.48

22.69

17.38

22.24

 

No

79.52

77.31

82.62

77.76

 

Second-hand smoke, (%)

    

0.018

Yes

14.68

17.58

14.27

12.97

 

No

85.32

82.42

85.73

87.03

 

FVC%pred

104.80 ± 14.54

103.97 ± 14.71

104.47 ± 14.70

105.77 ± 14.20

0.022

FEV1%pred

103.22 ± 14.61

101.00 ± 14.72

102.75 ± 14.65

105.39 ± 14.19

< 0.001

FEF25–75%pred

99.30 ± 25.65

95.64 ± 24.25

98.60 ± 26.65

102.79 ± 25.12

< 0.001

FEV1/FVC%pred

98.74 ± 7.76

97.34 ± 7.63

98.62 ± 7.85

99.91 ± 7.58

< 0.001

  1. Mean ± S.D. for continuous variables: the P value was calculated by the weighted linear regression model; (%) for categorical variables: the P value was calculated by the weighted chi-square test. Abbreviation: PIR, the ratio of income to poverty; BMI, body mass index; ALT, alanine aminotransferase; AST, aspartate aminotransferase; FVC%pred: forced vital capacity, pecent of predicted value; FEV1%pred: forced expiratory volume in one second, pecent of predicted value; FEF25–75%pred: forced expiratory flow 25–75%, pecent of predicted value; FEV1/FVC%pred: the FEV1/FVC ratio, pecent of predicted value
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BMC Pulmonary Medicine

ISSN: 1471-2466

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