Table 1

Characteristics of patients hospitalised for COPD

Study patients N=565Values*
Demographic characteristicsAge, years69±11
Men392 (69.4)
Married544 (96.3)
Local resident361 (63.9)
Lung function and complications†Pre-FEV11.16 (0.84, 1.73)
Respiratory failure63 (11.4)
Pulmonary heart diseases59 (10.7)
Hypoxemia10 (1.8)
VTE9 (1.6)
Pneumothorax2 (0.4)
Hypxic-hypercarbic encephalopathy4 (0.7)
Comorbidities†








Cardio/cerebrovascular diseases340 (61.7)
Diabetes102 (18.5)
Respiratory infection67 (12.2)
Bronchiectasis47 (8.5)
Reflux oesophagitis38 (6.9)
OSAS18 (3.3)
Lung cancer5 (0.9)
Anxiety depression12 (2.2)
Osteoporosis6 (1.1)
Obesity56 (9.9)
Admission
Admitted on Thursday–Sunday252 (44.6)
Admitted from emergency173 (30.7)
Seasons at admissionMarch–May164 (29.0)
June–August145 (25.7)
September–November94 (16.6)
December–February162 (28.7)
Air pollution at admissionO3, ug/m392 (63, 150)
PM2.5, ug/m352 (25, 88)
Hospital stay and healthcare costLength of stay, days10 (8, 14)
Direct cost of hospitalisation, US$2080.7 (1501.6, 2877.17)
  • *Data were represented as mean±SD or median (interquartile) for continuous variables where appropriate and n (%) for categorical variables.

  • †Fourteen patients’ complications and comorbidities were missing due to their unavailable data on secondary diagnoses.

  • COPD, chronic obstructive pulmonary disease; OSAS, obstructive sleep apnea syndrome; Pre-FEV1, Pre-bronchodilator forced expiratory volume in one second.; VTE, venous thromboembolism.