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State variables, their meanings, values ranges in humans, units, and dimensions in terms of the fundamental units of mass (M), length (L) and time (T).
| Quantity | Description | Value and Unit | Dimension | ||
| M | L | T | |||
| G(t) | Plasma glucose concentration at time t | ~100–300 mg/dl | 1 | -3 | 0 |
| l(t) | Plasma insulin concentration at time t | ~10–30 μU/ml | 1 | -3 | 0 |
| X(t) | An auxiliary function proportional to insulin concentration in the interstitial compartment. | ~0–10-3min-1 | 0 | 0 | -1 |
