Тема: Вирус
Показать сообщение отдельно
Старый 22.11.2021, 17:54   #662  
belugin is offline
belugin
Участник
Аватар для belugin
Сотрудники Microsoft Dynamics
Лучший по профессии 2017
Лучший по профессии 2015
Лучший по профессии 2014
Лучший по профессии 2011
Лучший по профессии 2009
 
4,622 / 2922 (107) +++++++++
Регистрация: 16.01.2004
Записей в блоге: 5
Цитата:
Сообщение от ax_mct Посмотреть сообщение
Не существует четких доказательств относительно масок на данный момент.
А что вы думаете про вот это https://www.bmj.com/content/375/bmj-2021-068302



Mask wearing and transmission of SARS-CoV-2, covid-19 incidence, and covid-19 mortality—The results of additional studies that assessed mask wearing (not included in the meta-analysis because of substantial differences in the assessed outcomes) indicate a reduction in covid-19 incidence, SARS-CoV-2 transmission, and covid-19 mortality. Specifically, a natural experiment across 200 countries showed 45.7% fewer covid-19 related mortality in countries where mask wearing was mandatory (table 1).49 Another natural experiment study in the US reported a 29% reduction in SARS-CoV-2 transmission (measured as the time varying reproductive number Rt) (risk ratio 0.71, 95% confidence interval 0.58 to 0.75) in states where mask wearing was mandatory.58

A comparative study in the Hong Kong Special Administrative Region reported a statistically significant lower cumulative incidence of covid-19 associated with mask wearing than in selected countries where mask wearing was not mandatory (table 1).69 Similarly, another natural experiment involving 15 US states reported a 2% statistically significant daily decrease in covid-19 transmission (measured as case growth rate) at ≥21 days after mask wearing became mandatory,50 whereas a cross sectional study reported that a 10% increase in self-reported mask wearing was associated with greater odds for control of SARS-CoV-2 transmission (adjusted odds ratio 3.53, 95% confidence interval 2.03 to 6.43).45 The five studies were rated at moderate risk of bias (fig 2).