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) |