Table 5.

Mean Neuropsychological Test Scores Using T-Scores

Neuropsychological Test	Placebo (n = 14)		CPAP (n = 17)		oxygen (n = 15)		p Valuea
	Pre	Post	Pre	Post	Pre	Post	Time	× Treatment
Digit Symbol, no. correct	49.1	51.8	45.7	50.3	53.6	56.9	< 0.001	0.202
Symbol Search, no. correct	51.3	52.9	49.8	52.7	54.4	57.5	0.066	0.887
Digit Vigilance, timeb	59.7	63.4	54.7	64.2	61.2	61.4	< 0.001	0.020
Trail Making A, timeb	52.5	58.1	44.6	50.5	48.2	55.1	< 0.001	0.888
Stroop Color, no. correct	47.1	51.0	46.4	48.2	46.0	52.8	0.001	0.225
Letter/Number Sequencing	47.4	57.7	42.0	54.3	42.2	53.6	< 0.001	0.888
Digit Span Total	59.6	63.3	51.8	56.6	53.9	59.2	< 0.001	0.837
Digit Vigilance, no. errorsb	40.1	43.9	48.4	47.7	45.8	48.3	0.193	0.387
Trail Making B, timeb	51.0	56.1	50.6	53.6	49.6	54.3	0.009	0.829
Stroop Color-Word ratio	46.4	50.9	48.9	46.1	49.1	51.1	0.487	0.215
Brief Visuospatial Memory Test-Rev—TR	52.9	54.7	53.3	59.3	53.6	56.1	0.163	0.109
Hopkins Verbal Learning Test-Rev—TR	46.3	44.7	42.4	40.8	49.3	50.8	0.654	0.542
Brief Visuospatial Memory Test-Rev—DR	57.6	51.9	58.4	57.6	57.7	56.3	0.020	0.150
Hopkins Verbal Learning Test-Rev—DR	46.1	43.2	44.5	43.3	48.7	48.5	0.348	0.776
Word Fluency Total	49.3	52.8	45.7	48.5	45.4	51.9	< 0.001	0.268
Global Deficit Scoresc	0.289	0.267	0.361	0.274	0.213	0.177	0.205	0.754

^ap Values are listed for the effects of time and the time × treatment interaction.

^bHigher T-scores indicate better performances.

^cHigher Global Deficit Scores indicate poorer performances. TR refers to total recall; DR refers to delayed recall.