Table 1 Sample characteristics for participants from the US Health and Retirement Study
Variable | Mean (SD) or n (%) |
|---|---|
Epigenetic age in 2016: GrimAge (years) | 69.4 (8.7) |
Chronological age in 2016 (years) | 71.6 (9.6) |
ADHD polygenic score | 0.0 (1.0) |
Gender | |
 Male | 996 (43.6%) |
 Female | 1289 (56.4%) |
Depressive symptoms | 1.0 (1.6) |
Smoking (lifetime pack years) | 27.5 (26.2) |
Body Mass Index (BMI) (kg/m2) | 27.8 (5.6) |
Cognition score | 17.7 (3.6) |
Education attained (years) | 13.6 (2.4) |
Income ($) | 82,358.4 (100,592.4) |