Four cell donors, four exposure modules and four exposure concentrations were varied within four different exposure sessions using a statistical experimental design called a hyper-Graeco-Latin square.
All of the specimens were subjected to four exposure conditions (tidal, splash, atmosphere and soil).
The chapter calculates the cancer risk from the lipophilic hexachlorocyclohexane (HCH) from four exposure pathways: air particles, air vapors, drinking water, and dermal.
This study was based on a bifactorial design with three Zn sublethal levels (0.0, 5.0, and 10.0 mg/L) and four exposure periods (7, 14, 28, and 56 days).
Four exposure conditions, referenced as CI (continuous immersion), DWCI (dry-wet cycle immersion), PIAWL (partial immersion above the water level) and PIUWL (partial immersion under the water level), were designed for the exposure tests.
Women were grouped in four exposure categories based on their first pregnancy only: 1) Women who had no previous pregnancy; 2) women who had a vaginal delivery; 3) women who had a CS, and 4) women who had an abortion.
Four exposure scenarios (i-iv) were defined.
For this analysis we defined a priori four exposure windows for each outcome of interest.
Figure 4 summarizes the model output Cfs for the four exposure metrics.
cAdjustment B, adjusted for other significant variables from all four exposure groups.
We defined a series of four exposure levels based on the exposure distribution of exposed controls.
