Yet you ignore my question about whether this is the same CDC that said masks don't work, or some other CDC?
Back to posting nonsense charts again --- since you cannot factually defend your dismal of many studies from respected scientists showing that masks work in schools. Why don't your create a chart for LA showing when restrictions were added and removed -- and then post proper information in meaningful context.
absolutely useless for drawing any useful conclusions. your second link is called a report... and that is all it is a report with statements. not a study. nothing useful. and the first study... found .. ventilation is important... which it could be if there is indoor aerosol transmission. (And there may be with delta... we need to see real studies on that.) But for those studies to come to conclusions about masks you would have to hold all sorts of things steady with respect to other factors... I did not see that being done. How could you when ventilation would change for each school. And positivity rates would be a big influence. Summary... Please prove with data and contact tracing that airborne transmission occurs. Then maybe we can determine how spread happens in schools.
show a study with real science and data that masks work in schools which is superior to the charts that Tsing is posting. I challenge you to put up such a study... and we will break it down and see if they came up with any useful science. I will bet ... at best you show correlations which is basically the point of Tsings charts.
I just posted a set of studies on this thread -- all today -- all from respected scientists which show masks work in schools. Go read them.
Here is the list of studies in classrooms once again -- go read them and educate yourselves. CDC Study examined 169 schools in Georgia and found that schools with student mask requirements had a 37% lower COVID rate among students than schools without mandates. This study was from late 2020 before Delta was prevalent. Mask Use and Ventilation Improvements to Reduce COVID-19 Incidence in Elementary Schools — Georgia, November 16–December 11, 2020 https://www.cdc.gov/mmwr/volumes/70/wr/mm7021e1.htm Summary What is already known about this topic? Kindergarten through grade 5 schools educate and address the students’ physical, social, and emotional needs. Preventing SARS-CoV-2 transmission in schools is imperative for safe in-person learning. What is added by this report? COVID-19 incidence was 37% lower in schools that required teachers and staff members to use masks and 39% lower in schools that improved ventilation. Ventilation strategies associated with lower school incidence included dilution methods alone (35% lower incidence) or in combination with filtration methods (48% lower incidence). What are the implications for public health practice? Mask requirements for teachers and staff members and improved ventilation are important strategies in addition to vaccination of teachers and staff members that elementary schools could implement as part of a multicomponent approach to provide safer, in-person learning environments. (More at above url) Research Finds Masks Can Prevent COVID-19 Transmission in Schools “With masking, the schools clearly can safely deliver face-to-face education for children and adults" https://today.duke.edu/2021/06/research-finds-masks-can-prevent-covid-19-transmission-schools The widespread use of masks in schools can effectively prevent COVID-19 transmission and provide a safe learning environment, two Duke scholars said Wednesday. Danny Benjamin, M.D., and Kanecia Zimmerman, M.D., were co-chairs of the Duke-led ABC Science Collaborative, which issued a new report Wednesday showing that North Carolina schools were highly successful in preventing the transmission of COVID-19 within school buildings. The report found in part that masks effectively prevented COVID-19 transmission even without physical distancing in schools and on buses. Benjamin and Zimmerman spoke to reporters Wednesday in a virtual media briefing. Watch the briefing on YouTube. Read a news story about the collaborative's findings on Duke Health's website. Here are excerpts: (More at above url) Researchers from NC State, UNC study effectiveness of masks, random testing in schools https://www.wavy.com/news/north-car...ctiveness-of-masks-random-testing-in-schools/ Aug 19, 2021 A local research team is looking at how COVID-19 spreads in school settings and how much mask-wearing and testing can help. The study found without masks and random testing, more than 75 percent of students would get COVID-19 over a semester. The study looked at “susceptible students,” those who are not vaccinated, and did not already have COVID-19. Maria Mayorga, a personalized medicine professor at North Carolina State University, is part of the research team. This is what the study found for elementary school students, who are too young to be vaccinated. “By the end of the semester if we do not mask, 90 percent of the students who were not already infected would become infected with the virus,” Mayorga said. “So that’s way too many students and it would not be possible for the students to stay in school, probably something would happen before then where they would be sent home or to a virtual environment.” Graphs from the study show masks reduce it to around 50 percent of students, and masks combined with random testing reduces it to just under 25 percent of elementary school students susceptible to the virus contracting COVID-19. That’s without going virtual due to outbreaks. Those numbers are lower in older grades because the study accounts for vaccinated students and those who already had COVID-19 (listed as incoming protection). “If you introduce the mask requirements in the school you can reduce the number of infections by more than 50 percent,” Mayorga said. Most central North Carolina school districts now have mask mandates. This study has not been peer-reviewed. The team is comprised of researchers from N.C. State, UNC-Chapel Hill, Eastern Carolina University, and Georgia Tech. You can read the full study here and see a slideshow of the presentation here. Mayorga said the next step in their research is measuring the effect school mask policies can have on communities. =================================== Research done in North Carolina, Wisconsin, Utah and Missouri has shown mask mandates effectively stymie coronavirus transmission rates in schools.
All flawed because of the comments I've posted earlier today - the first two times you posted them. Hey, I've got an idea! Maybe you can make another post with the same links, the way Futurecurrents used to do over and over again before the mods told him to knock it off?
Your comments and attempts to poke holes in the studies are laughable and have all been responded to. You should just be happy that your local schools now require masks so the your children can spend a longer time with in-person learning without being forced to remote as your schools get overwhelmed with Covid.