Fig. 1
Percentage of different PIFRBT and PIFRAT. Figure is percent stacked column charts of the PIFR distribution for patients using DPIs before and after technique training. a There were 21 (10.8%) patients with a PIFRBT < 30L/min and 86 (44.1%) patients with a PIFRBT ≥ 60L/min among all patients. The population and proportions of patients with a PIFRBT < 30L/min in ND/FU group were 10 (13.9%)/11(8.9%). The population and proportions of patients with a PIFRBT ≥ 60L/min in ND/FU group were 19 (26.4%)/67 (54.5%). b There were 3 (1.5%) patients with a PIFRAT < 30L/min and 118 (60.5%) patients with a PIFRAT ≥ 60L/min among all patients. COPD, chronic obstructive pulmonary disease; AE, acute exacerbation; ND, newly-diagnosed; FU, follow-up; PIFRBT, peak inhalation flow rate measured before-training; PIFRAT, peak inhalation flow rate measured after training