Table 2.

The relative drop in LSPU in A.U. compared to baseline after the injection of oxygen, carbogen, room air, and nitrogen. The time to baseline is the total time required for the LSPU to reach baseline. This was longer than 600 s for nitrogen and thus was not measured. The $R^2$ value is calculated between the RBF in ml/min and the LSPU in A.U.

	Oxygen	Carbogen	Room air	Nitrogen
Relative drop in LSPU	$34\pm 5.0\%$	$32\pm 4.0\%$	$30\pm 4.0\%$	$30\pm 12\%$
Time to baseline (s)	$124.1\pm 42.1$	$113.9\pm 28.1$	$404.5\pm 92.5$	$>600$
$R^2$ of LSPU (A.U.) and RBF (ml/min)	$0.81\pm 0.06$ ($p<0.0001$)	$0.74\pm 0.11$ ($p<0.0001$)	$0.59\pm 0.18$ ($p<0.0001$)	$0.36\pm 0.23$ ($p<0.0001$)