Table 2.

Multiple linear regression using OEF (%) as the dependent variable in young healthy subjects, R²= 0.59.

Variables	β ± SE	P
Age	0.33 ± 0.28	0.29
EtCO2	−0.90 ± 0.36	0.04

β: standardized beta coefficient; SE: standardized error; EtCO₂: end-tidal carbon dioxide.