1. Dependence of the gradient between arterial and end-tidal PCO2 on the fraction of inspired oxygen 
H. Yamauchi, S. Ito, H. Sasano, T. Azami, J. Fisher, K. Sobue 
British Journal of Anaesthesia 
Volume 107, Issue 4, Pages (October 2011)
DOI: /bja/aer171
Copyright © 2011 The Author(s) Terms and Conditions

2. Fig 1
The relationship between FIO2 and ΔPa−E′CO2. ΔPa−E′CO2 significantly increased between all FIO2 levels, except between the 0.33–0.5 and 0.75–0.97 levels. †P<0.05 vs #P<0.05 vs ‡P<0.05 vs 0.5.
British Journal of Anaesthesia  , DOI: ( /bja/aer171)
Copyright © 2011 The Author(s) Terms and Conditions

3. Fig 2
The relationship between FIO2 and Vdalv. The Vdalv values differed significantly between all FIO2 levels, except between the 0.33–0.5 and 0.75–0.97 levels. When FIO2 was 0.97, Vdalv increased by 86% when compared with the value when FIO2 was †P<0.05 vs #P<0.05 vs ‡P<0.05 vs 0.5.
British Journal of Anaesthesia  , DOI: ( /bja/aer171)
Copyright © 2011 The Author(s) Terms and Conditions

4. Fig 3
The relationships between FIO2 and PaCO2, or PE′CO2. The value of PaCO2 when FIO2 was 0.97 was statistically higher than the values at other FIO2 levels. The value of PE′CO2 at the FIO2 level of 0.21 was statistically higher than the values at other FIO2 levels, and the value at the FIO2 of 0.75 was statistically lower than the values at other FIO2 levels. #P<0.05 vs 0.33, 0.5, 0.75, and ‡P<0.05 vs 0.21, 0.33, 0.5, and †P<0.05 vs 0.21, 0.33, 0.5, and 0.75.
British Journal of Anaesthesia  , DOI: ( /bja/aer171)
Copyright © 2011 The Author(s) Terms and Conditions