Fig. 3 | Scientific Reports

Fig. 3

From: Relationships between capnogram parameters by mainstream and sidestream techniques at different breathing frequencies

Fig. 3

Correlations between the absolute values of time and volumetric capnography indices measured by mainstream (MS, horizontal axis) and sidestream capnography (SS, vertical axis). Linear regressions for low (blue), medium (black) and high (red) breathing frequencies are shown as continuous lines, grey dashed lines indicate the lines of identity. Pearson correlation coefficients (r) and p values for each breathing rate are shown separately in each panel with the corresponding colors. *: r values p < 0.05 vs. low, #: r values p < 0.05 vs. medium. ETCO2: end-tidal CO2; Sn2T and Sn3T: normalized phase 2 and 3 slopes in time capnogram, respectively; Sn2V and Sn3V: normalized phase 2 and 3 slopes in volumetric capnogram, respectively; VnDF: Fowler (anatomical) dead space fraction; VnDB: Bohr (physiological) dead space fraction.

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