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The proposed model, as opposed to the existing time-variant models, not only accounts for the variability of Cs with exposure time but also incorporates the effects of time to exposure and the effects of the concentration of chlorides in the exposure environment.
The input variables for the proposed model were selected based on best subset sampling analysis on the results of the experimental work to determine the influence of water-to-cement ratio, time to exposure, the concentration of chlorides in the exposure environment, and exposure time on Cs.
Survival analysis was used to compare the time to exposure for specific explanatory variables.
The mean time to exposure for females was 23±18 months and for males was 31±20 months.
We assessed scores sequentially over time and, by using risk-set sampling and controlling for time to exposure, were able to account for time-dependent variables.
That is, spot samples at the upper end of the distribution may represent samples collected closer in time to exposure events rather than necessarily indicating a higher absolute exposure level.
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In vitro study has shown that human normal osteoblast cell required minimal exposure time to MF exposure to increase cell proliferation [ 39].
"Young people and children would presumably be most vulnerable to getting it because they would have had less time to get exposure to it," Whitworth said.
Stay busy while at work and spare no time to risk exposure.
To account for this we partitioned person-time prior to exposure into separate risk periods.
Using date of death to time exposure to stress, we assume the relevant period of stress is the date of the death.
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