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TABLE 2: 
SI grades in various CSF spaces in patients breathing 50% and 100% O2 and in healthy volunteers breathing room air
CSF SpaceGroupControl (n = 25)Multiple Comparisons and P Value
Grade50% O2 (n = 21)100% O2 (n = 31)
CPA cistern0173750% O2 vs control, .002
I3316100% O2 vs control, <.001
II125250% O2 vs 100% O2, <.001
Ambient cistern01732250% O2 vs control, .586
I423100% O2 vs control, <.001
II026050% O2 vs 100% O2, <.001
Interpeduncular cistern01822450% O2 vs control, .324
I311100% O2 vs control, <.001
II028050% O2 vs 100% O2, <.001
Prepontine cistern061150% O2 vs control, .041
I628100% O2 vs control, <.044
II9281650% O2 vs 100% O2, <.001
Quadrigeminal cistern01832450% O2 vs control, .372
I331100% O2 vs control, <.001
II025050% O2 vs 100% O2, <.001
Suprasellar cistern01521850% O2 vs control, .936
I516100% O2 vs control, <.001
II128150% O2 vs 100% O2, <.001
Convexity sulci01932550% O2 vs control, .357
I210100% O2 vs control, <.001
II027050% O2 vs 100% O2, <.001
Fourth ventricle015121550% O2 vs control, .940
I158100% O2 vs control, .019
II514250% O2 vs 100% O2, .021
Third ventricle01882250% O2 vs control, .645
I1103100% O2 vs control, <.001
II213050% O2 vs 100% O2, <.001
Lateral ventricles018172150% O2 vs control, .900
I394100% O2 vs control, .008
II05050% O2 vs 100% O2, .008
Sylvian fissures02132550% O2 vs control, >.999
I0180100% O2 vs control, <.001
II010050% O2 vs 100% O2, <.001