| variable | variable_description | units | example_1 | example_2 |
| Study Number | The subject identifier | | 4 | 5 |
| IversusP | Insulin vs Placebo | 0=Placebo, 1=Insulin | 0 | 1 |
| Age | Age | Years | 53 | 71 |
| Gender | Gender | 1=Man. 2=Woman | 2 | 1 |
| Etnicity | Etnicity | | White | African American |
| Smoking | Smoking (Yes/No) | 0=No, 1=Yes | 0 | 0 |
| Height (in) | Height | Inches | 67 | 68 |
| Weight | Weight | Pounds | 155 | 157 |
| BMI | Body Mass Index | kg/m2 | 24.3 | 23.9 |
| Disease | PD=Parkinson Disease | | PD | PD |
| Disease Duration | Disease Duration | Years | 5 | 17 |
| SBP | Systolic Blood Pressure | mmHg | 113 | 114 |
| DBP | Diastolic Blood Pressure | mmHg | 69 | 74 |
| HR | Heart rate | beats/min | 70 | 62 |
| Walk-Duration | Walk Duration | seconds | 3.84 | 3.37 |
| Walk-NoSteps | Number of steps | # | 8 | 7 |
| AverStride (in) | Average Stride Length (Walk distance/Number of steps) | Inches | 18 | 21 |
| MOCA | The Montreal Cognitive Assessment | | 28 | 26 |
| Glucose | Serum glucose | mg/dL | 98 | 83 |
| Gait Speed | Gait speed | m/s | 1.136363636 | 1.567398119 |
| BDI | The Beck Depression Inventory | | 15 | 6 |
| F#words | Words starting with letter F | # | 11 | 16 |
| A#words | Words starting with letter A | # | 11 | 12 |
| S#words | Words starting with letter S | # | 12 | 9 |
| FAS | Verbal Fluncy Test | | 34 | 37 |