Experimental: Intervention - Asthmatuner

Asthmatuner (Medituner AB, Stockholm, Sweden) is a CE-marked cloud-computing-based system with a healthcare interface and a downloadable patient app (Android or iOS).The intended use of Asthmatuner is to automate asthma self-management by letting patients register symptoms and measure forced expiratory volume in one second (FEV1) with a Bluetooth spirometer (MIR, SmartOne). The patient then receives immediate feedback on the status of symptom control (controlled, partly controlled or uncontrolled), and a treatment recommendation, with an image of the correct inhaler or other type of medication and the dose. Symptom control is quantified based on lung function; litre to percentage of personalised best FEV1, using a cut-off ≤80% and symptoms during the last week based on four questions: 1) need for rescue medication more than twice due to asthma symptoms, 2) any daytime symptoms, 3) nocturnal symptoms/awakenings, and 4) limitation in physical activities.

No_intervention: Control group - Traditional asthma management

Traditional self-management is defined as all other types of non-digital asthma management. This could be treatment plan written on paper or by oral communication to patient/caregiver on asthma treatment.