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Table 1 Socio-demographic and clinical characteristics of 337 patients with COPD.

From: Factors affecting the relationship between psychological status and quality of life in COPD patients

  n = 337*
Males, n (%) 314 (93.2)
Age (years), m (SD) 67.9 (8.6)
Married, n (%) 272 (80.7)
Less than primary education, n (%) 139 (41.2)
Low socioeconomic status (IV-V), n (%) 255 (81.5)
Current workers, n (%) 55 (16.3)
Smoking status, n (%)  
   Current smoker 108 (32.8)
   Former smoker 219 (66.6)
   Never smoked 2 (0.6)
FEV1 post-bronchodilator (% pred.), m (SD) 52.4 (16.2)
MMRC dyspnea scale, median (P25-P75) 2 (2-3)
RV/TLC (%), m (SD) 55.6 (10.1)
DLco (% pred.), m (SD) 65.2 (20.8)
PaO2 (mmHg), m (SD) 74.3 (10.7)
PaCO2 (mmHg), m (SD) 41.8 (5.3)
6MWD (m), median (P25-P75) 440.0 (390.0-508.4)
BMI (Kg/m2), m (SD) 28.2 (4.7)
Comorbidities: Charlson index ≥2+, n (%) 187 (55.8)
Any respiratory drug treatment, n (%) 288 (85.5)
Long-term oxygen therapy, n (%) 27 (8.2)
  1. COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in one second; MMRC, Modified Medical Research Council; RV/TLC, residual volume/total lung capacity; DLco, diffusing capacity for carbon monoxide; PaO2, partial pressure of oxygen in arterial blood; PaCO2, partial pressure of carbon dioxide in arterial blood; 6MWD, 6-minute walking distance; BMI, body mass index.
  2. * Some variables had missing values: 24 in socioeconomic status, 8 in smoking status, 26 in RV/TLC, 46 in DLco, 11 in PaO2, 10 in PaCO2, 30 in 6MWD, 2 in Charlson comorbidities and 8 in long-term oxygen therapy.
  3. + One: only COPD; two or more: one or more comorbidities in addition to COPD.
  4. According to International Standard Classification of Occupations (ISCO).