Baseline characteristics of 2386 COPD subjects recruited from the general population in Copenhagen, Denmark
| All subjects*(n = 2386) | Women(n = 1100) | Men(n = 1286) | |
|---|---|---|---|
| *The numbers do not always add up to 2386 as some values are missing for certain variables: 11 in education, 5 in cohabitation, 72 in income, 12 in BMI, 117 in asthma, 9 in dyspnoea, 5 in sputum, 5 in smoking, 10 in lung function, and 10 in visits to doctors. | |||
| †Low household income was defined as income lower than 4000 Danish kroner per month. | |||
| ‡Ischaemic heart disease and asthma were self-reported and obtained from medical records. Dyspnoea was self-reported and categorised according to the Modified British Medical Research Council questionnaire.19 | |||
| ¶Sputum was considered present if subjects answered positively to the question “Do you usually bring up phlegm from your chest in the morning or during the day?”. | |||
| §COPD severity was classified according to GOLD stages.3 | |||
| **Any medical visit to any doctor in previous year includes visits to the general practitioner, specialist, emergency room or private doctor. | |||
| Sex, n (%) | 1100 (46.1) | 1286 (53.9) | |
| Mean (SD) age (years) | 59.5 (10.9) | 59.3 (10.8) | 59.7 (11.0) |
| Education (mean (SD) years at school) | 8.3 (1.9) | 8.3 (1.8) | 8.4 (2.0) |
| Low income, n (%)† | 946 (40.9) | 498 (47.8) | 448 (35.2) |
| Mean (SD) BMI (kg/m2) | 24.9 (4.2) | 24.2 (4.5) | 25.6 (3.8) |
| Ischaemic heart disease, n (%)‡ | 634 (26.6) | 249 (22.6) | 385 (29.9) |
| Asthma, n (%)‡ | 268 (11.8) | 131 (12.5) | 137 (11.3) |
| Dyspnoea, n (%)‡ | |||
| 0 (no dyspnoea) | 978 (41.1) | 421 (38.5) | 557 (43.4) |
| 1 (dyspnoea in effort) | 841 (35.4) | 410 (37.5) | 431 (33.6) |
| 2 (dyspnoea walking) | 240 (10.1) | 119 (10.9) | 121 (9.4) |
| 3 (dyspnoea at rest) | 318 (13.4) | 144 (13.1) | 174 (13.6) |
| Sputum, n (%)¶ | 939 (39.4) | 381 (34.7) | 558 (43.5) |
| Smoking, n (%) | |||
| Never | 230 (9.7) | 174 (15.9) | 56 (4.3) |
| Ex | 459 (19.3) | 184 (16.8) | 275 (21.4) |
| Current | 1692 (71.0) | 737 (67.3) | 955 (74.3) |
| COPD severity (GOLD stages), n (%)§ | |||
| I: Mild (FEV1 ⩾80%) | 833 (35.1) | 363 (33.1) | 470 (36.7) |
| II: Moderate (FEV1 <80% and ⩾50%) | 1095 (46.1) | 521 (47.6) | 574 (44.8) |
| III: Severe (FEV1 <50% and ⩾30%) | 354 (14.9) | 166 (15.2) | 188 (14.7) |
| IV: Very severe (FEV1 <30%) | 94 (3.9) | 45 (4.1) | 49 (3.8) |
| Any medical visit to any doctor in previous year, n (%)** | 1871 (78.8) | 911 (83.2) | 960 (74.9) |