The raw respiration signal has arbitrary units.
The mL values are calculated on the TidalVolume and MinuteVentilation only (please refer to this link).
We do a general calibration using the weight and height of the user. This calibration allows for the calculation of a coefficient which is then used as a conversion factor to convert the raw data into an adjusted value in liters. You can change that coefficient to fit any calibration using an API call.
Note: We plan to revisit this calibration method. Calibration may require an external device for a real gold standard reference, such as a spirometer.
Keywords: respiratory metrics, conversion factor