RESULTS	The PaO ( 2 ) in group 1 ( 79 + / - 9 ) mm Hg ( 1 mm Hg = 0.133 kPa ) and in group 2 ( 80 + / - 10 ) mm Hg were also increased significantly [ group 3 was ( 73 + / - 12 ) mm Hg ] ( F = 3.98 , P < 0.05 ) .\