Table 2.

Factors accounting for the control status of patients with COPD by level of severity at recruitment

	Total (n = 798)	FEV1 ≥ 50% (n = 498)	FEV1 < 50% (n = 300)	P-value
Clinical impact				< 0.001
Low, n (%)	546 (68.4)	318 (63.9)	228 (76.0)
High, n (%)	252 (31.6)	180 (36.1)	72 (24.0)
Stability
Stable, n (%)	362 (45.4)	262 (52.6)	100 (33.3)
Not stable, n (%)	436 (54.6)	236 (47.4)	200 (66.7)	< 0.001
Control status
Controlled, n (%)	264 (33.0)	184 (36.9)	80 (26.7)
Uncontrolled, n (%)	534 (67.0)	314 (63.1)	220 (73.3)	0.003

FEV1 forced expiratory volume in 1 s