Table 1.

Measured PCO₂ levels and deviation of PCO₂ from baseline by level and subject. Deviation of PCO₂ from baseline was analyzed with a one-way ANOVA using Scheffe’s method for multiple comparisons, showing no significant change in PCO₂ levels from baseline.

Measured PCO2 Levels
Level	Subject 1	Subject 2	Subject 3	Subject 4	Subject 5	Subject 6	Subject 7	Average	Std. Dev.
Baseline	44	**	43.1	32.9	32.8	34.8	38.1	37.2	4.5
Level 1	41.1	44.6	45.4	34.7	26	30.3	39.6	37.4	7.3
Level 2	40.3	43	47.4	39.2	30.1	35.9	33.6	38.5	5.8
Level 3	45	45.1	44.5	41.8	28.4	38.5	33.4	39.5	6.5
Level 4	*	48.3	***	33.9	27.7	37	36.4	36.7	7.5
Deviation of PCO2 from Baseline
Level	Subject 1	Subject 2	Subject 3	Subject 4	Subject 5	Subject 6	Subject 7	Average	Std. Dev.
Baseline	0	**	0	0	0	0	0	0.0	0.00
Level 1	−2.9		2.3	1.8	−6.8	−4.5	1.5	−1.4	1.77
Level 2	−3.7		4.3	6.3	−2.7	1.1	−4.5	0.1	1.77
Level 3	1		1.4	8.9	−4.4	3.7	−4.7	1.0	1.77
Level 4	*		***	1	−5.1	2.2	−1.7	−0.9	2.16

^*= Subject 1 did not reach level 4;

^**= Baseline PCO₂ measurements were not available for Subject 2

^***= Level 4 PCO₂ measurements were not available for Subject 2.)