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The scaling factor is driven by the infiltration factor (0.55 (95% CI: 0.52-0.58) [ 22] and the time spent indoors.
We determined the contribution to risk from indoor versus outdoor sources using indoor/outdoor ratios for gaseous compounds and the infiltration factor for particle-bound compounds.
The infiltration factor for NO2 was 0.58 (average of factors reported by [ 20, 62- 64]), and 0.72 for PM2.5 (average of factors reported by [ 64- 66]).
We converted the coefficients to a percent change in FEV1% per unit increase in pollutant, and divided by an infiltration factor to convert outdoor concentrations to equivalent indoor pollutant concentrations.
EXPOLIS data from Helsinki, Finland, showed the infiltration factor (the proportion of outdoor PM found indoors) for PM2.5 averaged 0.64 for residential structures, 0.47 for workplaces, and 0.35 for a subsample of office buildings constructed after 1990 (Hänninen et al. 2004b, 2005).
We used the phase distributions for each congener reported from the RIOPA study (Naumova et al. 2003) and assumed 100% infiltration efficiency for the gas-phase portion and an infiltration factor of 0.69 for the particle phase, from Meng et al. (2005) for the RIOPA data.
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Therefore, we first estimated air exchange rates and infiltration factors (Finf) at each site.
In order to check the multicollinearity, we evaluated variance infiltration factors.
k is the infiltration decay factor.
While these shifts in attack may be explained by factors such as acute inflammation, with fever and PMN infiltration, the factors that govern the specific bacterial shifts in remission, which is free of disease symptoms, are harder to suggest.
Immune cell infiltration, several factors expressed by adipose tissue (AT), and spontaneous release of cytokines by adipocytes were measured.
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