highly significantp = 0.001
Accordingly, FMD variation values were 102 ± 6.7% ( p = 0.168, NS = nonsignificant) and 94.3 ± 3.6% ( p < 0.0001) when utilizing a full-face mask and a half-face mask (regular mask), the difference between both conditions being highly significant ( p = 0.001) ( Figure 2 ).