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Table 2 Factors accounting for the control status of patients with COPD by level of severity at recruitment

From: COPD Clinical Control: predictors and long-term follow-up of the CHAIN cohort

 

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

  1. FEV1 forced expiratory volume in 1 s