⟳ Репост от T. Ryan Gregory 🇨🇦
This is like "Vaccines don't work. So we'll test to see if they work." "Our randomized study compared two groups. One group didn't get vaccinated. The other group looked at the syringes on the table then rubbed the labels on their forearms and left." "See? Vaccines don't work."
Linsey MarrNew JAMA paper describes an RCT with portable air filters in nursing homes in the UK. Filters were undersized and not always on. Guess what...there was no difference in wintertime respiratory infections. It's like testing a new drug at 20% of the recommended dose. www.cidrap.umn.edu/covid-19/can...