Finding F-0477

“The median (interquartile range, IQR) time/day with CO2 concentration > 800 ppm (primary outcome) was 110 min (IQR 47–207) at baseline, 82 min (IQR 12–226.5) during sham periods, 78 min (IQR 20–154) during intervention periods and 140 min (IQR 19.5–612.5) post-intervention.”

Laurent Monitors to improve indoor air carbon dioxide concentrations in the hospital: A randomized crossover trial (2022). The Science of the total environment. Page 2. CKB 8326

Structure

Factor: Carbon dioxide (CO₂)
Population: geriatric inpatients and staff
Setting: hospital patient room, BE
Study design: randomized, sham-controlled, crossover, open-label trial (February to May 2021): CO2 monitors placed in twelve double-bed patient rooms across two geriatric wards of a Belgian hospital, staff instructed to open windows, increase air exchange and reduce crowding to keep CO2 at or below 800 ppm; primary outcome time per day above 800 ppm (class 3)
Effect: median 140
Averaging time: minutes per day above 800 ppm
Sample: 12 rooms
Caveat: time above a threshold recorded as a level; the authors attribute the higher post-intervention value mainly to an imbalance in rooming-in

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.