Demographic, smoking and symptom reporting data by predominant airway diagnosis among 2061 participants
| Any COPD,* n (%) | Any COPD excluding chronic bronchitis alone, n (%) | Asthma only, n (%) | No reported diagnosis, n (%) | |
| Number | 252 (12.2) | 165 (8.0) | 230 (11.2) | 1579 (76.6) |
| Mean age (SD) | 70.7 (8.3) | 70.7 (7.7) | 68.1 (8.1) | 69.3 (8.9) |
| (95% CI) | (69.6 to 70.7) | (69.5 to 71.8) | (67.1 to 69.2) | (68.7 to 70.2) |
| Men | 145 (57.5) | 96 (58.2) | 90 (39.1) | 765 (48.4) |
| Mean %IS (SD)† | 27.1 (16.5) | 26.7 (16.0) | 22.6 (17.2) | 19.2 (16.5) |
| Current smoker | 48 (19.0) | 36 (21.8) | 20 (8.7) | 152 (9.6) |
| Former smoker | 164 (65.1) | 111 (67.3) | 111 (48.3) | 639 (40.5) |
| Never smoker | 38 (15.1) | 18 (10.9) | 92 (40.0) | 762 (48.3) |
| Smoking status unknown | 2 (0.8) | 0 | 7 (3.0) | 26 (1.6) |
| Pack year, mean (SD) | 30.5 (28.7) | 36.0 (27.8) | 15.6 (21.8) | 11.7 (17.9) |
| (n=243) | (n=162) | (n=214) | (n=1516) | |
| Pack year > 20 | 136 (56.0) | 110 (67.9) | 61 (28.5) | 347 (22.9) |
| Shortness of breath (MRC3‡) | 190 (75.4) | 136 (82.4) | 122 (53.0) | 273 (17.3) |
| Winter morning cough | 170 (67.5) | 110 (66.7) | 107 (46.5) | 218 (13.8) |
| Winter morning sputum | 148 (58.7) | 95 (57.6) | 78 (33.9) | 200 (12.7) |
| Chest tightness or difficulty breathing | 201 (79.8) | 141 (85.5) | 162 (70.4) | 256 (16.2) |
| Wheezing in last year | 194 (77.0) | 137 (83.0) | 137 (59.6) | 244 (15.5) |
The differences among the categories are statistically significant (p<0.05) in three-way comparisons (among any chronic obstructive pulmonary disease (COPD) (or any COPD excluding chronic bronchitis), asthma, and no reported diagnosis).
↵* COPD or emphysema or chronic bronchitis, and may include concomitant asthma.
↵† Missing data for mean %Income Support (%IS), n=132, distributed similarly across all groups.
↵‡ Medical Research Council grade 3 shortness of breath.