Finding F-1612

“During a crossover intervention period of seven weeks, we observed that, in the filter-on group, indoor PM2.5 levels significantly decreased by up to 43%.”

Kim et al. Association between Peak Expiratory Flow Rate and Exposure Level to Indoor PM2.5 in Asthmatic Children, Using Data from the Escort Intervention Study (2020). International journal of environmental research and public health. Page 1. CKB 7936

Structure

Factor: Particulate matter (PM₂.₅ and PM₁₀)
Intervention: Air filtration and air purifiers
Setting: home, KR
Study design: crossover randomised intervention in the homes of asthmatic children aged 6 to 12: portable air filtration switched on and off over seven weeks, with indoor fine particles measured continuously and peak expiratory flow rate recorded by the children (class 2)
Effect: other 43
Caveat: by up to this share, so an upper bound over the crossover period

A Finding records what one published document states, verbatim and with its page. It is not a conclusion of Coridum; see the Claims that build on it.