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Table 1 Characteristics of the study population at baseline (n = 90)

From: Assessing health status in COPD. A head-to-head comparison between the COPD assessment test (CAT) and the clinical COPD questionnaire (CCQ)

COPD GOLD stage
  Stage I(mild) Stage II (moderate) Stage III (severe) Stage IV (very severe) P-value
N 15 42 27 6  
Males (%) 86.7 86 96.3 100 0.41
Age (years) 68 (58–74) 67 (62–73) 68 (61–73) 63 (53–75) 0.78
Pack years 60 (42–75) 55 (34–81) 70 (40–92) 68 (50–151) 0.52
BMI (kg/m²) 27 (26–32) 29 (25–34) 26 (24–30) 25 (21–29) 0.12
Current smoking (%) 53.3 52.4 51.9 33.3 0.84
FEV1 (% predicted) 83 (81–86) 62 (56–70) 37 (33–44) 22 (20–27) p < 0.01
6MWD (m) 450 (360–480) 420 (315–545) 360 (300–420) 375 (255–458) 0.07
MRC dyspnea grade 1 (1–2) 1 (1–2) 2 (1–3) 3 (2–4) P < 0.01
BODE index quartile      
(n(%))      
1 15 (100.0) 40 (95.2) 8 (29.6) 1 (16.7)  
2   1 (2.4) 14 (51.9) 1 (16.7)  
3   1 (2.4) 4 (14.8) 3 (50.0)  
4    1 (3.7) 1 (16.7)  
  1. Data represent median (interquartile range). BMI = body mass index. Pack years: amount of cigarette packs smoked per day multiplied by the amount of years smoked. 6MWD = 6 Minute Walking Distance. MRC = Medical Research Council dyspnoea scale. BODE: body mass index, airflow limitation (forced expiratory volume in one second), dyspnoea and 6-min walk distance. FEV1 = Post-bronchodilator Forced Expiratory Volume in 1 s 20 min after inhaled bronchodilator. GOLD stages = COPD classification by post-bronchodilator spirometry according to GOLD guidelines.