Table 4 Follow-up interval and improvement of pMDI technique
| Follow-up interval | Number of patients | Number of patients with improvement at follow-up | Percentage (%) of patients with improvement |
|---|---|---|---|
| 1–3 months | 25 | 9 | 36% |
| 3–6 months | 25 | 6 | 24% |
| 6–9 months | 18 | 2 | 11% |
| 9–12 months | 4 | 2 | 50% |