| Chronic cough |
Coughing on most days for 3 consecutive months or more during the year |
| Chronic sputum |
Coughing phlegm on most days for 3 consecutive months or more during the year |
| Wheezing |
Wheezing or whistling in the chest during the year |
| Shortness of breath |
Shortness of breath either when hurrying on the level ground or walking up a slight hill |
| Fair or poor general health |
Self-reported fair or poor health in general |
| Worse health in the recent 1 year |
Compared with the previous 12 months, general health is worse |
| Outpatient visits ≥3 times per year |
During the previous 12 months, more than 3 visits to a doctor or other health care professional without being hospitalized overnight |
| Hospitalization ≥1 time per year |
Having been a patient in a hospital overnight during the previous 12 months |
