Linear mixed model parameter estimates of the effects of airflow resistance and the children’s characteristics on the inspiratory parameters.

PIF: peak inspiratory flow rate; FIR20–80%: flow increase rate; Vi: inhaled volume; ti: inhalation time.aReference category is R5.bReference category is male.cReference category is no airways disease.dHeightresid = Height – Heightexp. Heightexp obtained by linear regression: Heightexp = 6.152 *Age +83.362 (adjusted R2 = .804).The dataset can be found in the Supporting Information (Data S1).