Questionnaires
Parents filled out an initial questionnaire about medical history,
living environment, and quality of life. In the period between the first
and final visit (± six weeks), parents kept a questionnaire based
journal about their child’s symptoms. The most clinically relevant
parameters extracted from these questionnaires were age at onset of
noisy breathing, age at first cold, number of colds, parent reported
outcome about burden in the past three days (PROb) and
parent reported outcome about symptoms in the past three days
(PROs).