The quality and quantity of exposure to each language varies for every child, leading to differences in the home literacy environment.
Biomarkers of exposure allow statements about the quality and/or quantity of exposure, whereas with biomarkers of effect statements about effects and the health status of exposed organisms can be made.
However, our index of quantity of exposure might not be well suited to our population who reported using solvents regularly.
However, even more important than the quantity of exposure of students to this subject, is the quality with which it is taught.
However, the effect is likely to vary according to the quantity of exposure, so assessment of the exposure distribution is preferable over dichotomous exposure assessment (which just compares all exposed to the unexposed).
The strengths of this study include the large number of birth records, high quantity of exposure data (including some biweekly data), and the ability to evaluate multiple time periods of exposure to specific THMs and HAAs.
First, we will examine the extent to which inter-country anxiety-depression prevalence differences are associated with variation in the quantity of exposure to risks such as unemployment, poor general health and high levels of trauma exposure [ 17].
Some authors have detected problems of sensitivity when comparing self-declared data with the study of biomarkers, which is probably due to the difficulties of identifying sources, duration and quantity of exposure.
Future studies should seek to elucidate these mechanisms, as well as how the timing and quantity of exposure to EDCs such as triclosan and BPA over the life course influence immune function and later-life disease susceptibility and severity.
However, when we accounted for the quantity of exposure, evaluating the relationship PM2.5 and the HRV markers, we observed statistically significant associations with all four HRV parameters (SDNN, rMSSD, LF and HF).
