Respiratory symptoms and exposures reported by participants at baseline, first and second follow-up.
| % (95% CI) | |||
| Baseline (n=1481) | Follow-up 1 (n=1090) | Follow-up 2 (n=989) | |
| Respiratory symptoms | |||
| Cough: Do you usually cough when you do not have a cold? | 11.1 (9.6 to 12.9) | 10.1 (8.4 to 12.0) | 25.3 (22.6 to 28.1) |
| Sputum: Do you usually bring up phlegm from your chest when you do not have a cold? | 2.6 (1.8 to 3.5) | 4.9 (3.7 to 6.3) | 11.1 (9.2 to 13.2) |
| Wheeze: Have you had wheezing/whistling in your chest in the last 12 months, in the absence of a cold? | 1.6 (1.0 to 2.3) | 1.7 (1.0 to 2.6) | 3.0 (2.1 to 4.3) |
| MRC dyspnoea II: Are you troubled by shortness of breath when hurrying on the level or walking up a slight hill? | 1.6 (1.0 to 2.3) | 6.6 (5.2 to 8.2) | 11.8 (9.9 to 14.0) |
| Functional limitation: Have breathing problems interfered with your usual daily activities? | 2.9 (2.1 to 3.9) | 5.7 (4.4 to 7.2) | 7.1 (5.6 to 8.9) |
| Any respiratory symptom (any of the above five symptoms) | 13.6 (11.9 to 15.4) | 19.6 (17.3 to 22.1) | 36.2 (33.3 to 39.4) |
| Self-reported exposures | |||
| Current smoker | 13.9 (12.2 to 15.8) | 11.6 (9.7 to 13.6) | 12.9 (10.9 to 15.2) |
| Previous TB | 3.2 (2.3 to 4.2) | 3.0 (2.1 to 4.2) | 2.6 (1.7 to 3.8) |
TB, tuberculosis.