Resting PETCO2: ≤/>33 mmHg
Group	Characteristics	Subjects meeting criteria	Major Cardiac Events	Percent Event Free
A	>33 mmHg	237	54	77.2%
B	≤ 33 mmHg	116	50	56.9%
Log rank: 16.3, p<0.001
NYHA class: I/II vs. III/IV
Group	Characteristics	Subjects meeting criteria	Major Cardiac Events	Percent Event Free
A	I/II	196	41	79.1%
B	III/IV	157	63	59.9%
Log rank: 16.3, p<0.001
LVEF: ≤/>25%
Group	Characteristics	Subjects meeting criteria	Major Cardiac Events	Percent Event Free
A	>25%	216	48	77.8%
B	≤25%	137	56	59.1%
Log rank: 18.0, p<0.001