Research Article
Reduced Effective Oxygen Delivery and Ventilation with a Surgical Facemask Placed under Compared to over an Oxygen Mask: A Comparative Study
Figure 1
Box and Whisker plots of sampled FiO2 at the lips with a surgical facemask only, an O2 mask only, a surgical facemask over an O2 mask, and a surgical facemask under an O2 mask. The circles, squares, and triangles represent average values for each of the five subjects in the various mask configurations.