Table 1– Population characteristics at first examination
Subjects with COPDSubjects without COPDp-value
Subjects n12708734
Males57.942.4<0.001
Age years56.2±9.548.5±12.6<0.001
Marital status0.040
 Married/cohabiting68.465.9
 Other31.634.1
Cohabitation0.030
 Alone32.830.2
 With others67.269.8
Education years at school8.4±1.99.0±2.2<0.001
BMI kg·m−224.6±3.725.1±4.00.001
 <209.26.60.002
 20–2549.349.0
 >2541.544.3
FEV1 L2.1±0.82.9±0.9<0.001
FEV1 % predicted67.0±18.290.9± 15.4<0.001
FEV1/FVC %63.0±6.983.4± 6.8<0.001
GOLD stage
 I24.3
 II57.4
 III15.9
 IV2.4
Self-reported symptoms and comorbidities
 Diabetes0.62.4<0.001
 Cardiac comorbidities32.426.5<0.001
 Chest pain38.133.50.001
 Leg pain while walking11.910.10.046
Smoking
 Current smoker79.154.8<0.001
 Never-smoker5.826.3<0.001
 Ex-smoker15.118.9<0.001
Smoking years34.5±11.524.6±12.8<0.001
Self-reported baseline physical activity level<0.001
 Low19.514.6
 Moderate51.553.8
 High29.031.7
  • Data are presented as % or mean±sd, unless otherwise stated. The first examination may be different for each subject (Copenhagen City Heart Study examination 1, 2 or 3). COPD: chronic obstructive pulmonary disease; BMI: body mass index; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; GOLD: Global Initiative for Chronic Obstructive Lung Disease.