The number of subjects according to the times of pulmonary function tests
| The times of pulmonary function tests | Subjects excluded from the analysis (1–3 times) | Subjects included in the analysis (4–8 times) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||||
| Group 1 | n | 40 | 30 | 15 | 21 | 18 | 12 | 23 | 20 | 85 | 94 |
| (n = 179) | % | 22.3 | 16.8 | 8.4 | 11.7 | 10.1 | 6.7 | 12.8 | 11.2 | 47.5 | 52.5 |
| Group 2 | n | 77 | 35 | 36 | 36 | 31 | 51 | 47 | 45 | 148 | 210 |
| (n = 358) | % | 21.5 | 9.8 | 10.1 | 10.1 | 8.7 | 14.2 | 13.1 | 12.6 | 41.3 | 58.7 |
| Group 3 | n | 48 | 24 | 22 | 14 | 9 | 33 | 25 | 21 | 94 | 102 |
| (n = 196) | % | 24.5 | 12.2 | 11.2 | 7.1 | 4.6 | 16.8 | 12.8 | 10.7 | 48.0 | 52.0 |