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Table 1 Baseline characteristics of participants

From: Association between lipoproteins and telomere length in US adults: data from the NHANES 1999–2002

Telomere length (R/S ratio)

Q1

Q2

Q3

Q4

P value

n

1617

1617

1617

1617

 

lipoprotein

 LDL-C, mean ± SD (mg/dL)

128.66 ± 32.64

125.47 ± 33.47

120.82 ± 33.24

120.14 ± 34.41

< 0.0001

 HDL-C, mean ± SD (mg/dL)

50.27 ± 14.85

50.67 ± 16.01

50.95 ± 15.26

51.42 ± 15.02

0.1641

 Triglycerides, mean ± SD (mg/dL)

159.05 ± 136.78

145.78 ± 106.29

146.08 ± 153.61

129.76 ± 101.80

< 0.0001

Sociodemographic variables

 Age, mean ± SD (years)

54.54 ± 16.91

46.34 ± 15.34

41.57 ± 14.67

37.37 ± 13.04

< 0.0001

 Poverty to income ratio, mean ± SD (years)

0.75 ± 0.08

0.93 ± 0.04

1.09 ± 0.05

1.40 ± 0.25

< 0.0001

Sex (%)

    

0.2236

 male

51.04

49.18

47.37

49.19

 

 female

48.96

50.82

52.63

50.81

 

Race/Ethnicity (%)

    

< 0.0001

 Mexican American

7.01

7.84

8.90

6.70

 

 Non-Hispanic Black

7.94

8.51

9.55

12.92

 

 Non-Hispanic White

75.75

73.36

69.74

66.70

 

 Other Hispanic

6.07

6.36

6.69

9.37

 

 Other race/ethnicity

3.24

3.93

5.13

4.31

 

Education (%)

    

< 0.0001

 less than high schoo

27.77

21.22

20.97

17.70

 

 high school

25.76

26.44

24.83

26.27

 

 more than high school

46.48

52.34

54.20

56.03

 

Martial Status (%)

    

< 0.0001

 married

71.65

65.36

60.13

53.23

 

 single

23.25

28.38

34.21

39.37

 

 living with partner

5.10

6.27

5.66

7.40

 

Variables of laboratory data

 ALT, mean ± SD (U/L)

26.38 ± 20.63

26.61 ± 21.67

26.68 ± 56.22

26.18 ± 27.74

0.9715

 AST, mean ± SD(U/L)

25.68 ± 20.19

24.26 ± 12.58

23.66 ± 11.28

24.65 ± 22.67

0.0096

 Blood urea nitrogen, mean ± SD (mg/dL)

15.14 ± 6.26

13.74 ± 4.68

13.34 ± 5.05

13.11 ± 4.44

< 0.0001

 Creatinine, mean ± SD(mg/dL)

0.86 ± 0.49

0.83 ± 0.43

0.82 ± 0.39

0.80 ± 0.28

0.0003

 C-reactive protein(mg/dL)

0.51 ± 0.88

0.43 ± 0.83

0.40 ± 0.65

0.33 ± 0.56

< 0.0001

 Uric acid, mean ± SD(mg/dL)

5.52 ± 1.51

5.32 ± 1.41

5.29 ± 1.48

5.26 ± 1.46

< 0.0001

Medical examination and personal life history

 Body Mass Index, mean ± SD (kg/m2)

28.67 ± 6.09

28.25 ± 6.27

27.78 ± 6.14

27.42 ± 6.25

< 0.0001

Physical Activity (MET-based rank) (%)

    

< 0.0001

 Sits

26.29

19.47

19.37

18.22

 

 Walks

27.42

29.48

25.63

27.99

 

 Light loads

18.92

18.84

19.68

19.08

 

 Heavy work

27.36

32.21

35.31

34.72

 

Current or Past Cigarette Smoker (%)

    

< 0.0001

 none

47.76

47.87

53.41

53.81

 

 current

30.24

26.73

21.59

19.15

 

 past

22.00

25.40

25.00

27.04

 

Dietary interview - individual foods

 Alcohol, mean ± SD (gm)

9.31 ± 36.24

10.49 ± 30.58

11.41 ± 32.26

15.07 ± 46.08

< 0.0001

 Caffeine, mean ± SD (mg)

220.92 ± 276.11

233.16 ± 325.75

190.05 ± 226.56

179.96 ± 250.56

< 0.0001

 Calcium, mean ± SD (mg)

832.32 ± 681.72

847.10 ± 551.24

881.93 ± 613.60

901.43 ± 642.76

0.0053

 Carbohydrate, mean ± SD (gm)

258.16 ± 141.13

275.16 ± 136.13

281.59 ± 128.51

295.30 ± 142.53

< 0.0001

 Cholesterol, mean ± SD (mg)

274.05 ± 242.38

297.85 ± 242.96

298.35 ± 254.11

293.91 ± 234.86

0.0191

 Dietary fiber, mean ± SD (gm)

15.86 ± 11.70

15.71 ± 9.86

15.61 ± 9.61

16.14 ± 10.66

0.4535

 Energy, mean ± SD (kcal)

2084.67 ± 1023.12

2241.17 ± 1039.35

2272.85 ± 1018.07

2367.07 ± 1085.04

< 0.0001

 Total monounsaturated fatty acids, mean ± SD (gm)

29.81 ± 18.42

32.12 ± 20.16

31.56 ± 19.47

32.15 ± 19.17

0.0021

 Total polyunsaturated fatty acids, mean ± SD (gm)

16.14 ± 10.83

17.65 ± 12.43

17.04 ± 11.51

17.39 ± 11.84

0.0024

 Total saturated fatty acids, mean ± SD (gm)

25.88 ± 17.18

27.99 ± 16.81

28.04 ± 18.00

28.32 ± 17.37

0.0003

 Total fat, mean ± SD (gm)

79.32 ± 46.23

86.01 ± 49.33

84.40 ± 48.42

85.63 ± 48.05

0.0003

Comorbidities (%)

Any Diabetes (FBG > = 126 mg/dL or self-report)

    

< 0.0001

 No

89.27

93.06

93.87

95.14

 

 Yes

10.73

6.94

6.13

4.86

 

Any Hypertension (BP > = 139/90 or self report)

    

< 0.0001

 No

66.69

76.41

77.14

82.74

 

 Yes

33.31

23.59

22.86

17.26

 

Any CAD (self report)

    

< 0.0001

 No

94.80

97.14

98.13

98.85

 

 Yes

5.20

2.86

1.87

1.15

 

Any family with heart attack or angina

    

< 0.0001

 No

67.61

65.43

60.84

59.47

 

 Yes

32.39

34.57

39.16

40.53

 
  1. Mean +/− SD for continuous variables: P value was calculated by weighted linear regression model
  2. % for Categorical variables: P value was calculated by weighted chi-square test