Carbon Dioxide Inhalation Induces Dose-Dependent and Age-Related Negative Affectivity
Figure 3
Intensity of PSL panic symptoms in four different CO2 conditions.
a) PSL: air vs 9% p = 0.76; air vs 17.5% and vs 35% p ≤ 0.0001; 9% vs 17.5% and vs 35% p ≤ 0.0001; 17.5% vs 35% p ≤ 0.0001. b) Younger versus older subjects: p = 0.217