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. Author manuscript; available in PMC: 2010 Oct 13.
Published in final edited form as: Circ Heart Fail. 2010 Mar 3;3(3):405–411. doi: 10.1161/CIRCHEARTFAILURE.109.906446
Ventilatory Class Meeting criteria Major Cardiac Events Percent Event Free
I: ≤29.9 244 19 92.2%
II: 30–35.9 252 58 77.0%
III: 36–44.9 201 90 55.2%
IV: ≥45.0 94 64 31.9%
Log rank: 193.9, p<0.001