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Variables in Mechanistic Models
| Variable | Meaning | Units |
|---|---|---|
 |
Instantaneous pain level on 0–10 scale | Pain |
 |
Concentration of drug 1 (long-acting opioid) in the body | Standard doses |
 |
Concentration of drug 2 (short-acting opioid) in the body | Standard doses |
 |
Concentration of drug 3 (nonopioid) in the body | Standard doses |
 |
Instantaneous probability distribution of pain level P | Probability |
