Fig. 4.
Influence of body mass index on elastances. Boxplots represent median and interquartile values of elastances. Respiratory system elastance is colored in black, lung elastance (EL) in red, and chest wall elastance (ECW) in blue. The plain and dotted arrows represent ratio in low and high body mass index groups, respectively. The more the body mass index increases, the more the ratio increases, suggesting that for a given airway plateau pressure, the amount of pressure bore by the chest wall increases with body mass index.