Table 1.
Characteristics of population based on S-Klotho plasma levels quartiles (N = 10,393).
| Characteristic | S-Klotho level quartiles | P value | |||
|---|---|---|---|---|---|
| Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | ||
| Age (years) | 57.40 | 56.28 | 55.99 | 55.03 | <0.01 |
| Gender | <0.01 | ||||
| Female (%) | 24.13 | 24.36 | 25.55 | 25.96 | |
| Male (%) | 25.40 | 28.04 | 25.60 | 20.96 | |
| Race | <0.01 | ||||
| White (%) | 25.09 | 27.01 | 25.76 | 22.14 | |
| Mexican (%) | 23.59 | 25.84 | 27.49 | 23.08 | |
| Black (%) | 24.50 | 20.59 | 20.87 | 34.03 | |
| Other (%) | 22.72 | 23.87 | 27.22 | 26.18 | |
| Marital status | 0.31 | ||||
| No married (%) | 25.69 | 24.78 | 25.18 | 24.35 | |
| Married (%) | 24.26 | 26.73 | 25.77 | 23.25 | |
| Education | 0.01 | ||||
| Grade or less (%) | 25.17 | 26.52 | 24.40 | 23.91 | |
| High school (%) | 27.40 | 25.03 | 26.37 | 21.19 | |
| Some college (%) | 25.12 | 26.62 | 26.32 | 21.94 | |
| College or more (%) | 22.34 | 26.11 | 24.86 | 26.69 | |
| Poverty | 3.26 | 3.32 | 3.36 | 3.33 | 0.58 |
| Smoke | <0.01 | ||||
| Never (%) | 22.36 | 25.44 | 25.94 | 26.26 | |
| Former (%) | 26.67 | 26.03 | 25.84 | 21.45 | |
| Now (%) | 28.30 | 28.08 | 24.04 | 19.58 | |
| Energy intake (kcal/day) | 1970.11 | 2013.07 | 2023.08 | 1989.21 | 0.23 |
| BMI | 29.73 | 29.50 | 29.51 | 29.28 | 0.30 |
| Waist circumference (cm) | 102.85 | 102.26 | 101.76 | 100.37 | <0.01 |
| Use of medication (%) | <0.01 | ||||
| Yes | 25.73 | 26.71 | 24.87 | 22.69 | |
| No | 22.29 | 24.55 | 27.31 | 25.85 | |
| CDAI | 0.78 | 1.31 | 1.44 | 1.38 | <0.01 |
CDAI: composite dietary antioxidant index; BMI: body mass index.