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Air purifiers in classrooms for infection control: a pilot study including a randomized multiple crossover trial to evaluate effectiveness in reducing particulate matter
Background Air purifiers with high-efficiency particulate air (HEPA) filters aim to reduce particulate matter from the air, including infectious aerosols, potentially lowering airborne disease transmission in classrooms. This pilot study, informing a larger randomized trial (RCT), explored the acceptability and feasibility of air purifiers in classrooms, and estimated their effect on particulate matter (PM2.5) concentration.
Objectively measured environmental factors in relation to school travel mode among adolescents: a decision tree analysis - International Journal of Behavioral Nutrition and Physical Activity
The present study has a cross-sectional design that used baseline data from the School In Motion (ScIM) project conducted during the school year 2017–2018. The design and methods for the main project have been reported elsewhere [26, 27]. In summary, 2084 adolescents aged 14–15 years, who were in the 8th grade, consented to participate in the ScIM project.
Why were so few randomized trials of public health and social measures conducted during the COVID-19 pandemic? The Norwegian experience - Trials
We reviewed all randomized trials proposed and initiated at the Centre for Epidemic Interventions Research (CEIR) during the first 4 years of the COVID-19 pandemic. Of the 18 proposed trials, five were completed, one was ongoing, and one halted after recruitment began. The remaining 11 trials were not implemented. One of the key legal and ethical barriers to conducting trials was the Norwegian Health Research Act, which demands informed consent from all participants.
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