Acceptability and preference of three inhalation devices assessed by the Handling Questionnaire in asthma and COPD patients

Table 5 Results of linear and logistic regressions performed to investigate the influence of devices characteristics on their practicality

All population	N. attempts before achieving correct preparation			Successful first attempt
	delta	95 % C.I.	p-value	OR	95 % C.I.	p
Duration of first explanation	0.58^a	0.33–0.82	p < 0.0001	0.45^a	0.24–0.85	p < 0.05
Duration of second explanation	0.26^a	0.19–0.33	p < 0.0001	0.58^a	0.49–0.69	p < 0.0001
Duration of third explanation	−0.37^a	−0.47–−0.27	p < 0.0001	1.94^a	1.46–2.61	p < 0.0001
Number of manoeuvres	0.38^b	0.32–0.43	p < 0.0001	0.50^b	0.42–0.58	p < 0.0001

^aEach 10 sec. increment in the duration of explanation, ^bevery additional manoeuvre to prepare the inhalation

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