Finding F-1448

“Improvement in ventilation rates was associated with a statistically significant reduction (66%, 432 to 149 ng/ m3, p < 0.01) in the normalized median concentration of PCBs in indoor air.”

Mitigation of building-related polychlorinated biphenyls in indoor air of a school… (2012). Environmental health : a global access science source. Page 5. CKB 6768

Structure

Factor: Polychlorinated biphenyls (PCBs)
Intervention: Ventilation
Setting: school
Study design: intervention study in a school building with polychlorinated biphenyls in the caulk: indoor air concentrations measured before and after improved ventilation, encapsulation of accessible caulk, encapsulation behind convectors and construction of false walls, normalised and compared with the Wilcoxon rank sum test (class 3)
Effect: median
Caveat: one building; the study also reports encapsulation of the accessible caulk at 22 %, from 282 to 220 ng/m3, which was only marginally significant

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.