Fig. 3

Mean values and 95% confidence intervals of blood gas analysis outcomes

Figure description: Indicated are capillary carbon dioxide- (PCO2) (primary outcome) and oxygen partial pressure (PO2), pH, lactate, base excess and perceived exertion, perceived dyspnoea, pain during the walking and the stair climbing condition with no mask and a FFP2 mask. Significant ANOVA results are indicated with an asterisk (*)