Exposure in investigations of dose-response relationships can be characterized in different ways, including peak exposure; duration of exposure at or above a set level; average exposure, which is a time-weighted average of exposure; or cumulative exposure, which is the sum of time-weighted exposures.
The variable in the horizontal axis is an average of exposure to real estate in 1995 1997 across all banks that lent to the industry in 2008Q4.
The individual annual average of exposure to air pollutants calculated from the address at birth was related to prevalence and cumulative incidence of reported symptoms.
Two time periods for the survey tools were chosen so that a) a longer-term average of exposure could be determined that would better correspond to the weighted average of exposure obtained from the hair sample collected, and b) recall bias could be better controlled using a short time frame, although quantification of consumption of the less frequently consumed species would be compromised.
Specifically, the average time between visits was 4.75 months, but the length of hair samples provided for a weighted average of exposure corresponding to approximately a 5.5- to 6-month period (assuming a hair growth rate of 1 1.1 cm/month).
However, we focused primarily on the 2-day moving average of exposure on the same day and the previous day (lag01) a priori based on previous studies (Wong CM et al. 2002, 2008).
Formaldehyde risks were then calculated based on the date of hire/first exposure, minimum employment duration, duration of employment/exposure, time since first exposure, cumulative exposure, average exposure, average intensity of exposure, peak exposure, and number of peak exposures.
All participants had been exposed to war, and the average number of exposures was high (mean 14.9, s.d. = 7.5).
Actual duty cycles of WLAN are thus of importance for time-averaging of exposure when checking compliance with international guidelines on limiting adverse health effects.
