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Table 1 Baseline characteristics according to log-transformed total carotene quartiles: NHANES, 1999-2018a

From: Dietary carotenoid intakes and biological aging among US adults, NHANES 1999–2018

Variables

Total carotene (N = 27338)

P

≤ 3.46

N = 6835

3.46–3.80

N = 6835

3.80–4.08

N = 6835

>4.08

N = 6834

Age, years

42.73(42.07,43.39)

45.58(44.93,46.24)

49.76(49.08,50.43)

49.50(48.73,50.27)

0.045

Male, %

44.20(42.60,45.70)

46.20(44.50,47.90)

49.20(47.70,50.70)

53.40(51.70,55.00)

< 0.001

Non-Hispanic white, %

65.70(62.00,69.20)

69.10(66.20,71.80)

70.40(67.50,73.10)

72.20(69.50,74.70)

0.334

BMI, kg/m2

28.98(28.73,29.23)

28.94(28.71,29.18)

28.89(28.61,29.16)

28.43(28.14,28.72)

< 0.001

Smoke, %

49.10(47.30,50.90)

45.30(43.20,47.30)

43.40(41.80,45.10)

42.30(40.70,43.90)

0.235

Drink, %

70.30(68.60,72.00)

73.70(71.80,75.50)

74.20(72.40,75.90)

76.70(75.00,78.30)

< 0.001

Regular exercise, %

35.10(33.70,36.60)

39.10(37.40,40.90)

41.20(39.40,43.10)

41.90(39.90,44.00)

< 0.001

College graduate or above, %

47.00(44.80,49.20)

56.90(54.50,59.30)

62.10(60.10,64.10)

65.80(63.80,67.70)

< 0.001

> 55,000 annual household income, %

34.50(32.30,36.80)

43.10(40.70,45.60)

47.60(45.70,49.60)

48.30(46.10,50.40)

< 0.001

Daily energy intake, kcal/d

1818.05(1794.15,1841.95)

1991.63(1969.03,2014.23)

2123.14(2098.85,2147.43)

2289.52(2264.18,2314.86)

< 0.001

Dietary supplements use, %

45.70(43.50,47.80)

53.40(51.40,55.30)

56.20(54.20,58.10)

58.30(56.50,60.10)

< 0.001

AHEI score

29.11(28.75,29.47)

30.81(30.43,31.18)

32.89(32.53,33.25)

33.71(33.24,34.19)

< 0.001

Retinol, mcg

389.67(378.37,400.97)

433.24(417.11,449.36)

430.37(416.68,444.06)

440.27(428.38,452.17)

< 0.001

Self-reported cancer, %

9.10(8.10,10.20)

10.00(9.00,11.20)

9.50(8.60,10.60)

9.50(8.70,10.40)

< 0.001

Self-reported hypertension, %

32.30(30.60,34.00)

30.90(29.50,32.40)

29.30(27.70,30.90)

30.50(28.80,32.30)

0.007

Self-reported cardiovascular diseases, %

9.90(8.90,11.00)

8.30(7.50,9.20)

7.40(6.60,8.40)

7.70(7.00,8.50)

< 0.001

Self-reported diabetes, %

9.50(8.70,10.40)

9.30(8.50,10.20)

9.10(8.10,10.20)

8.40(7.40,9.40)

0.589

Allostatic Load

0.28(0.27,0.28)

0.27(0.26,0.27)

0.26(0.25,0.26)

0.26(0.25,0.26)

< 0.001

Homeostatic Dysregulation

1.63(1.61,1.66)

1.58(1.56,1.60)

1.56(1.54,1.58)

1.54(1.51,1.56)

< 0.001

Klemera-Doubal Method

40.06(39.45,40.67)

39.77(39.23,40.31)

39.31(38.69,39.92)

39.19(38.55,39.83)

< 0.001

phenoAge

45.98(45.28,46.68)

45.96(45.31,46.61)

45.63(44.92,46.34)

45.75(44.98,46.53)

< 0.001

  1. aContinuous variables were listed as weighted mean (95% CI). Categorical variables were listed as weighted percentage (95% CI). After adjusting for age, general linear models and chi-square tests were conducted to compare continuous and categorical baseline characteristics, respectively