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Frequency of critical errors according to type of inhaler.
| Characteristics | MDI | DPI | SMI | |||
|---|---|---|---|---|---|---|
| n | % | n | % | n | % | |
| Total | 66 | 94.2 | 23 | 32.9 | 22 | 31.4 |
| Errors | ||||||
| 1. Prepare dose | 24 | 36.4 | 1 | 4.4 | 0 | 0.0 |
| 2. Full exhalation | 48 | 72.8 | 16 | 69.6 | 14 | 63.7 |
| 3. Inhalation | 25 | 37.9 | 8 | 34.8 | 2 | 9.1 |
| 4. Breath-holding | 23 | 34.9 | 6 | 26.1 | 6 | 27.3 |
| 5. Rinse mouth | 20 | 30.3 | 2 | 8.7 | - | - |
| Good inhaler technique | 15 | 22.7 | 7 | 30.4 | 7 | 31.8 |
MDI: metered-dose inhalers; DPI: dry powder inhalers; SMI: soft-mist inhalers.
