Table 1: Percentage of COPD and non-COPD in each of the population characteristics.

Item COPD (%) Non COPD (%) p-value OR AUROC
Sex Male 14.8 85.2 0.005
 3.13
 0.613
Female 5.3 94.7
Age Group (Years) < 50 3.2 96.8 < 0.001 -

 0.712
50 -60 15.3 84.7
≥ 60 21.9 78.1
Smoking intensity (pack-years) < 15 1.1 98.9 < 0.001 -

 0.721
15-30 4.4 95.6
≥ 30 19.7 80.3
Cough In the morning yes 33.7 66.3 < 0.001 9.05
 0.734
No 5.3 94.7
Day yes 47.3 52.7 < 0.001 15.48
 0.748
No 5.5 94.5
Daily for three months yes 44.0 56.0 < 0.001 7.93
 0.603
No 9.0 91.0
Dyspnoea Walking (without other diseases) yes 81.0 19.0 < 0.001 53.58
 0.683
No 7.3 92.7
Climbing one flight of steps
(at a normal rate)		 yes 68.9 31.1 < 0.001 249.05
 0.940
No 0.9 99.1
Walking on level ground yes 77.4 22.6 < 0.001 57.14
 0.757
No 5.7 94.3
Dressing or washing yes 87.5 12.5 < 0.001 65.58
 0.576
No 9.6 90.4
Non cardiac yes 10.0 90.0 0.690 0.88
 0.501
No 11.2 88.8
Wheeze Yes 35.1 64.9 < 0.001
 8.81
 0.722
No 5.8 94.2
Phlegm In the morning yes 30.2 69.8 < 0.001 5.20
 0.649
No 7.7 92.3
Day yes 25.9 74.1 0.022 3.10
 0.550
No 10.1 89.9
Daily for three months yes 18.2 81.8 0.223 1.84
 0.519
No 10.8 89.2
Asthma Diagnosed yes 28.6 71.4 0.021 3.51
 0.546
No 10.2 89.8
Family history yes 11.8 88.2 0.476 1.08
 0.507
No 11.0 89.0
Physical fitness Oppression yes 55.2 44.8 < 0.001 14.60
 0.66
No 7.8 92.2
Spontaneous drowning yes 25.0 75.0 0.060
 2.85
 0.535
No 10.5 89.5
Drowning on exertion yes 58.8 41.2 < 0.001
 14.29
 0.601
No 9.1 90.9
Waking up drowning yes 24.0 76.0 0.048
 2.74
 0.540
No 10.3 89.7
General physical fitness Normal 9.6 90.4 0.024
 0.407
 0.569
Non normal 20.7 79.3
Cardio-respiratory history Rhinitis and/or Sinusitis yes 11.4 88.6 0.954 1.02
 0.502
No 11.1 88.9
Heart disease yes 32.0 68.0 0.003
 4.32
 0.565
no 9.8 90.2
Pulmonary disease yes 37.5 62.5 0.017
 5.03
 0.526
no 10.7 89.3
Pneumonia yes 28.1 71.9 0.005
 3.63
 0.568
no 9.7 90.3

OR: odds ratios; AUROC: Area under the receiver operating characteristic curve.