Feasibility and Measurement Quality of Home-Based Smartphone Spirometry in Children With Suspected Asthma: A Multicentre, Prospective Study.

Of 101 children with technically valid data, 93.1% performed at least one measurement series at home, while 31.7% completed measurements on all seven study days.

Clinically usable measurement quality (grades A-C for both FEV 1 and FVC) was achieved at least once by 61.7% (manual grading) and 74.5% (automated grading).

Measurement quality was not significantly associated with age, supervision, or social factors.