Characteristics of eligible patients
| China | Hong Kong | Korea | Malaysia | The Philippines | Singapore | Taiwan | Vietnam | Total | |
| Number eligible n | 381 | 349 | 252 | 342 | 230 | 271 | 295 | 358 | 2478 |
| Age yrs | 45.7±21.5 | 35.6±18.9 | 43.9±16.5 | 32.6±15.1 | 35.9±17.3 | 33.9±18.3 | 41.1±22.2 | 40.3±16.8 | 38.8±19.1 |
| Females# | 51 | 39 | 69 | 55 | 58 | 55 | 53 | 60 | 54 |
| Smokers | 19 | 21 | 20 | 19 | 27 | 21 | 25 | 13 | 20 |
| Symptom severity index | |||||||||
| Mild intermittent | 46 | 59 | 48 | 57 | 60 | 65 | 55 | 30 | 52 |
| Mild persistent | 23 | 14 | 19 | 23 | 14 | 19 | 19 | 23 | 20 |
| Moderate persistent | 14 | 17 | 18 | 11 | 11 | 12 | 15 | 28 | 16 |
| Severe persistent | 17 | 10 | 14 | 8 | 15 | 4 | 11 | 18 | 12 |
Data are presented as mean±sd or %, unless otherwise indicated. #: Sex not recorded for six patients.