Welcome to the Perceptive Readers #HonestyBestPolicy See also quote below
“When you do a study, not only do you need to identify the adverse effects, but you need to determine the exposure to these conditions. If a person works a 40 hrs week and he commutes by public transport we can say that this person will wear a mask on average for 45 hrs per week. This doesn’t take into account all the other public places the person needs to wear a mask, such as the groceries or restaurants. So let’s assume the average North American is forced to wear a mask for 50 hrs per week. How do we evaluate the health hazards of a 30% oxygen impairment for 50 hrs per week over a 4 to 6 months period or more?” – G. V.