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. 2021 Jun 23;16:1913–1924. doi: 10.2147/COPD.S311178

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© 2021 Ding et al.

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The proportion of correct and wrong steps. (A) Patients’ technique of each step of HAN. (B) Patients’ technique of each step of TUR. (C) Patients’ technique of each step of DIS.

Notes: The step of “fast and deep inhalation” (the sixth step of HAN, the fifth step of TUR and the fourth step of DIS) was not evaluated, but the measurement of PIF was used to evaluate it.

Abbreviations: HAN, HandiHaler^®; TUR, Turbuhaler^®; DIS, Diskus^®.