Fig 4.

Respiratory system elastance (E_rs) during slow relaxed expiration from total lung capacity (1.0) to functional residual capacity (0.0). The data are presented as means ± SE. We therefore determined the slopes of linear fits to E_rs versus normalized volume over the lower 20% of the volume range, with the exception of the last point (volume of 0). These slopes of mean $E_{rs}$ over the lower 20% of the volume range were determined by linear regression. The slopes for the 2 obese groups are significantly greater in magnitude compared with those of the 2 lean groups as assessed by the fact that their respective ± SE ranges do not overlap. LONA, late-onset nonallergic.