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Blah blah blah. Probably just a numbers game. Wonder who requested the test. Too many tests are geared to get the answers they want and not true results. The same amount of oxygen does go through a mask, but with breathing issues, it is harder to pull the same volume of air through it. Kind of like a vacuum cleaner trying to suck a rag though. Any activity with a mask on I am huffing and puffing very hard and my chest starts hurting severely. Same activity without a mask, no issues.