| Variable | Tool used | Type of the variable | Measurement scale | Total # of items | Score range |
| SUD Score | Subjective Units of Distress | Dependent (primary outcome) | Continuous | 1 | 0 - 10 |
| Heart Rate Variability | Camera HRV app using rMSSD measure for HRV | Dependent (secondary outcome) | Continuous | 1 | 0 - 100 |
| Type of emotion | Naming the emotion felt | Independent | Categorical | 1 | – |
| Location in body | Naming the location in the body | Independent | Categorical | 1 | – |