Table 1 Monitored variables during two 5 min tests within the open and sealed HEF
From: A novel application of capnography during controlled human exposure to air pollution
| Variable | Label |
|---|---|
| Identification and class variable | |
| ID | Subject ID # |
| EXP | Test number (1-first or 2-second) |
| EtCO 2 wave parameters | |
| POINTS | Number of CO2 measurements (20 samples/second) per one respiratory cycle |
| tot_len | Total time from STARTPOINT to ENDPOINT (seconds) |
| tot_AUC | Cross sectional area under the curve depicting detectable CO2 (mm Hg X seconds) |
| len2 | Time from STARTPOINT to start of alveolar plateau (seconds) |
| slope2 | Slope from STARTPOINT to start of alveolar plateau (mm Hg/second) |
| diff2 | CO2 absolute change from STARTPOINT to start of alveolar plateau (mm Hg) |
| len3 | Time from start to end of alveolar plateau (seconds) |
| slope3 | Slope from start to end of alveolar plateau (mm Hg/second) |
| diff3 | CO2 absolute change from start to end of alveolar plateau (mm Hg) |
| EtCO2 | End tidal CO2 (maximum expired CO2 (mm Hg) |
| AUC3 | Cross sectional area under the alveolar plateau (mm Hg X seconds) |
| EtCO2 Wave Signal Statistics | |
| MIN | Minimum (lowest) CO2 value from STARTPOINT to ENDPOINT |
| MAX | Maximum (highest) CO2 value from STARTPOINT to ENDPOINT |
| CORRMAX | Maximum (highest) CO2 value corrected for minimum (zero) value |
| MEAN | Mean CO2 value from STARTPOINT to ENDPOINT |
| MED | Median CO2 value from STARTPOINT to ENDPOINT |
| STDEV | Standard deviation of mean CO2 value from STARTPOINT to ENDPOINT |
| RMS | (true) Root mean square of CO2 values from STARTPOINT to ENDPOINT |
| Minute Ventilation Variables | |
| RR | Average respiratory rate (breaths/minute) |
| VTE | Average expiratory tidal volume (liters/BTPS) |