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 | Â |
   ID | Subject ID # |
   EXP | Test number (1-first or 2-second) |
EtCO 2 wave parameters | Â |
   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 | Â |
   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 | Â |
   RR | Average respiratory rate (breaths/minute) |
   VTE | Average expiratory tidal volume (liters/BTPS) |