Read about the study (
https://www.acpjournals.org/doi/10.7326/M20-6817)
It's pathetic. They literally listed variable adherence as a limitation of the study, as well as missing data and patient-reported findings on home test kits.
"Encouragement to follow social distancing measures for coronavirus disease 2019, plus either no mask recommendation or a recommendation to wear a mask when outside the home among other persons together with a supply of 50 surgical masks and instructions for proper use."
Come on this has as much integrity as a spaghetti skyscraper.