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Survival rates in COPD according to percent predicted postbronchodilator FEV₁ (PB FEV₁) ≤65 years of age in patients

Initial PB FEV₁ (percent predicted)	Number	Culmulative survival rate (percent)
Initial PB FEV₁ (percent predicted)	Number	At 2 years	At 5 years	At 10 years	At 15 years
<20	9	44	11	11	0
20 to 29	40	65	30	10	3
30 to 39	43	83	47	21	7
40 to 49	26	92	89	39	30
50 to 59	21	95	95	57	32
60+	9	100	89	89	67

FEV₁: forced expiratory volume in one second; PB: postbronchodilator.

Reference: Traver GA, Cline MG, Burrows B. Predictors of mortality in chronic obstructive pulmonary disease. A 15-year follow-up study. Am Rev Respir Dis 1979; 119:895.

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Survival rates in COPD according to percent predicted postbronchodilator FEV1 (PB FEV1) ≤65 years of age in patients

Survival rates in COPD according to percent predicted postbronchodilator FEV₁ (PB FEV₁) ≤65 years of age in patients