Table. 1—

Clinical characteristics of the patients included

1st phase2nd phase
Subjects n9711167
Sex males809 (83.1)1,031 (88.3)
Age yrs68.5±11.770±31.7
Smoking#820 (85.1)1,048 (89.8)
Cigarettes packs·yr−1NR53.8±33.7
Diagnosis
 COPD794 (81.9)1,030 (88.3)
 Chronic bronchitis124 (12.8)157 (13.5)
 Emphysema170 (17.5)134 (11.5)
 Bronchiectasis49 (5.1)44 (3.8)
 Asthma76 (7.8)43 (3.7)
 Pulmonary function (FEV1 % pred)NR48±16.1
Predominant symptoms
 Exertional dyspnoea825 (85.2)1,031 (88.3)
 Episodic dyspnoea481 (49.7)357 (30.6)
 Chronic cough722 (74.6)772 (66.2)
 Expectoration633 (65.4)718 (61.5)
  • Data are presented as n (%) or mean±sd. COPD: chronic obstructive pulmonary disease; FEV1 % pred: forced expiratory volume in one second per cent predicted; NR: not reported in the first phase. #: smokers or ex-smokers; : the percentages add up to >100% because each patient may have more than one diagnosis or predominant symptom.