Fig. 1

IOS measures across four BMI-groups (1: Underweight or normal weight, 2: Overweight, 3: Obese and 4: Morbidly obese) and four disease groups (1: asthma only, 2: COPD (± asthma), 3: lung disease conditions, and 4: non-lung disease conditions). Each subfigure presents a bar chart showing the level of (a) R₅%, (b) R_5-20, (c) A_X, and (d) Fres