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Date: March 20, 2021 09:29PM
https://www.exmormon.org/phorum/read.php?2,2363027,2363035#msg-2363035https://www.acpjournals.org/doi/10.7326/m20-6817"The most important limitation is that the findings are inconclusive, with CIs compatible with a 46% decrease to a 23% increase in infection. Other limitations include the following. Participants may have been more cautious and focused on hygiene than the general population; however, the observed infection rate was similar to findings of other studies in Denmark (26, 30). Loss to follow-up was 19%, but results of multiple imputation accounting for missing data were similar to the main results. In addition, we relied on patient-reported findings on home antibody tests, and blinding to the intervention was not possible. Finally, a randomized controlled trial provides high-level evidence for treatment effects but can be prone to reduced external validity."
"Yet, the findings were inconclusive and cannot definitively exclude a 46% reduction to a 23% increase in infection of mask wearers in such a setting. It is important to emphasize that this trial did not address the effects of masks as source control or as protection in settings where social distancing and other public health measures are not in effect."
Thus, these findings do not provide data on the effectiveness of widespread mask wearing in the community in reducing SARS-CoV-2 infections"
https://www.forbes.com/sites/leahrosenbaum/2020/11/18/lead-researcher-behind-controversial-danish-study-says-you-should-still-wear-a-mask/?sh=516e458f39e7"While the study found little evidence that masks protected the wearers from Covid-19, it should not be used as evidence to not wear a mask. “Even a small degree of protection is worth using the face masks,” says Dr. Henning Bundgaard, professor of Cardiology at Rigshospitalet in Denmark and lead author of the study, “because you are protecting yourself against a potentially life-threatening disease."
"70%: That’s how much wearing a mask reduces the risk of Covid-19 transmission, according to studies in the U.S. and in Thailand."
https://www.factcheck.org/2020/11/danish-study-doesnt-prove-masks-dont-work-against-the-coronavirus/"The trial evaluated whether giving free surgical masks to volunteers and recommending their use safeguarded wearers from infection with the coronavirus, in addition to other public health recommendations. The study didn’t identify a statistically significant protective effect for wearers, but the trial was only designed to detect a large effect of 50% or more. And the study didn’t weigh in on the ability of masks to prevent spread of the virus from wearers to others, or what’s known as source control, which is thought to be the primary way that masks work.
The study was conducted at a time when Danish authorities were not recommending masks to the general public, so most people both groups would encounter were not likely to be masked. Both groups were told to follow national public health guidance, which included physical distancing, avoiding crowds and washing hands."
https://www.covidfaq.co/Claim-A-Danish-study-shows-masks-don-t-work-e2bb579390ea4fed9802d8b2106ad7cd1) The study only looked at protection of the wearer.
2) Problems were pointed out before the study appeared
3) The study was too small.
4) There are other reasons to think masks work
For details on each, see actual link.