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Measures of variance for physiologic variables (tidal volume, respiratory rate, heart rate, and O2 saturation). Expressed as mean, standard deviation, coefficient of variation, and average range per spontaneous breathing trial (SBT).
| Physiologic variable | Mean value | Stdev | Coefficient of variation | Average range/SBT |
|---|---|---|---|---|
| Tidal volume (mL) | 461.9 | 176.1 | 0.38 | 87.4 |
| Respiratory rate (breaths per min) | 20.6 | 7.3 | 0.35 | 3.9 |
| Heart rate (beats per min) | 87.9 | 16.3 | 0.19 | 5.8 |
| O2 saturation (%) | 96.3 | 2.8 | 0.03 | 1.5 |
