Fig. 4

a Device-related handling characteristics, assessed by asthma and COPD patients. The best possible rating was 5, the worst 1. Design = “I like the design of the device“. Easy to learn = “It was easy to learn how to use the device“. Easy to prepare = “It was easy to prepare the device“. Comfortable in hand = “The device is comfortable when held in my hand“. Comfortable mouth piece = “The mouthpiece was comfortable when using the device“. b Device-related handling characteristics, assessed by asthma and COPD patients. The best possible rating was 5, the worst 1. Easy to use = “The device was easy to use“. Correct use = “I felt that I had used the device correctly“. Easy in emergency situations = “I think it is possible to use the device easily and correctly in emergency situations“. Satisfied = “I am satisfied with the device“