Table 3 –
The list of all predictors included in the RF model ordered according to the minimal depth index is presented.
| Rank | Variable | Scaling | MDI |
|---|---|---|---|
| 1 | Age | years | 2.29 |
| 2 | Forgetfulness | 1=mild, 3=severe | 3.97 |
| 3 | Physical functioning | 0=low, 100=high | 4.13 |
| 4 | Optimism | Life Orientation Test-Revised, range: 6–30 | 5.20 |
| 5 | Hemoglobin | GM/dL | 5.28 |
| 6 | Glucose | mg/dL | 5.36 |
| 7 | Sleep disturbance | 0=no, 4=frequent | 5.44 |
| 8 | Systolic blood pressure | mmHg | 5.53 |
| 9 | Education | 1=didn’t attend, 11=doctoral degree | 5.55 |
| 10 | Depressive symptom severity | 0 – 1. Higher scores indicate greater depressive symptom severity | 5.77 |
| 11 | Emotional well-being | Rand 36 Health Survey, Emotional wellbeing subscale (0–100). Higher scores indicate better emotional well-being | 5.91 |
| 12 | White blood count | 10^3/ul | 5.92 |
| 13 | LDL cholesterol | mg/dL | 5.95 |
| 14 | Health Eating Index | 0–100. Higher indicates healthier diet | 5.98 |
| 15 | Body Mass Index | Kg/m2 | 5.99 |
| 16 | Stressful Life Events | 0=none 33=high | 6.00 |
| 17 | C-reactive protein | mg/dL | 6.05 |
| 18 | Social support | 9=low 45=high | 6.07 |
| 19 | Insulin | pmil/L | 6.07 |
| 20 | Creatinine | mg/dL | 6.16 |
| 21 | Triglycerides, total | mg/dL | 6.16 |
| 22 | Glycemic Index (total carbs) | 0–>0 carbohydrates/day | 6.19 |
| 23 | Cynical Hostility | Cynicism subscale of Cooke-Medley Questionnaire, range: 0–13. Higher scores indicate greater hostility | 6.26 |
| 24 | WHI Hormone Trial treatment arm | Estrogen, estrogen + progesterone, placebo | 6.29 |
| 25 | HDL cholesterol | mg/dL | 6.39 |
| 26 | Social strain | 4=none, 20=all | 6.68 |
| 27 | Total energy expended in recreational activity per wk. | Kcal/week per kg | 6.70 |
| 28 | Hearing loss | 1=mild, 3=severe | 6.71 |
| 29 | US Region of country | 1=Northeast 2=South 3=Midwest 4=West | 6.85 |
| 30 | Life satisfaction | 0=dissatisfied, 10=satisfied | 7.00 |
| 31 | Occupation | Managerial/professional, technical/sales, homemaker only, service/labor | 7.03 |
| 32 | Walk > 10 min | 0=rarely, 5=7 or more times each week | 7.15 |
| 33 | Alcohol intake | 1=none, 6=7+servings/week | 7.30 |
| 34 | 1 yr change in health status | 1=much better, 5= much worse | 7.82 |
| 35 | General health status | 1=Excellent, 5=poor | 7.90 |
| 36 | Difficulty concentrating | 1=mild, 3=severe | 8.30 |
| 37 | Social functioning | 0=poor, 100= high | 8.40 |
| 38 | Moderate-strenuous activity >/=20 min/wk | 1=no activity, 4=moderate or strenuous activity | 8.75 |
| 39 | Major money problems | 1=not too much, 3=very much | 8.92 |
| 40 | Race/Ethnicity | 1=Amer Indian/Alaskan Native, 2=Asian or Pacific Islander, 3=Black or African American, 4=Hispanic/Latino, 5= White | 9.12 |
| 41 | Trouble with vision | 1=mild, 3=severe | 9.22 |
| 42 | Marital status | 1=never married, 2=divorced/separated, 3=widowed, 4=married, 5=marriage-lke relationship | 9.28 |
| 43 | Smoking | 0=never, 1=past, 2=current | 9.59 |
| 44 | Hypertension | 0=No, 1=Yes | 9.69 |
| 45 | Live alone | 0=No, 1=Yes | 9.75 |
| 46 | Contraceptive use, ever | 0=No, 1=Yes | 9.86 |
| 47 | Hypercholesterolemia | 0=No, 1=Yes | 10.40 |
| 48 | Cardiovascular disease, ever | 0=No, 1=Yes | 10.49 |
| 49 | Diabetes, ever | 0=No, 1=Yes | 10.91 |
| 50 | Cancer, ever | 0=No, 1=Yes | 11.12 |