Table 2.

Impact level of COPD on health status and GOLD spirometry criteria

GOLD spirometry criteria		Impact level of COPD on health status
Stage 1	FEV1> 80%	Low impact	Score < 10
(mild disease)	FEV1/FVC< 70%
Stage 2	FEV1: 50 – 80%	Mod impact	Score : 10 – 20
(moderate disease)	FEV1/FVC< 70%
Stage 3	FEV1: 30 – 49%	High impact	Score: 21 – 30
(sever disease)	FEV1/FVC< 70%
Stage 4	FEV1< 30%	Very high impact	Score > 30
(very sever disease)