Thanks for that, and I have updated towards masks being more useful for non-infected people to prevent getting sick than I previously thought—though not much for the usefulness of advocating mask wearing for the public, given shortages.
I do suspect that the poorly fitting masks were useful for other reasons, like reducing hand-to-mouth contacts and increasing handwashing—which was reported as 10% higher for adherent mask wearers than non-adherent ones, potentially contributing to the effect. (It was unfortunately not reported for the control group.)
Thanks for that, and I have updated towards masks being more useful for non-infected people to prevent getting sick than I previously thought—though not much for the usefulness of advocating mask wearing for the public, given shortages.
I do suspect that the poorly fitting masks were useful for other reasons, like reducing hand-to-mouth contacts and increasing handwashing—which was reported as 10% higher for adherent mask wearers than non-adherent ones, potentially contributing to the effect. (It was unfortunately not reported for the control group.)