To enable an exact comparison, age groups and educational levels were defined according to the US reference sample: age groups, 40 54 years and 55 70 years; educational levels, ≤12 years (ISCED 0 2), 13 15 years (ISCED 3 4), and ≥16 years (ISCED 5).
Patterns of analyte urinary concentration or mass excretion rates (nanograms per hour and nanograms per kilogram per hour BW) were assessed in sample age groups for case study chemicals bisphenol A and 2,5-dichlorophenol.
Once the communities were selected, sampling age groups for subjects 0 5 years, 6 15 years, 16 24 years, 25 59 years and ≥60 years were selected.
The sampled age groups contain relatively few people with university level education.
Circles correspond to sampled age groups, whereby z-scored expression values are generated from averages of randomly measured replicates representing separately sampled cohorts in standard (green) or defined (purple) diets.
Hundred DNA samples (age groups 20 29, 30 39, 40 49, 30 39, and 40 49 years; N = 10 in each group) derived from immortalized Japanese B-cell lines were obtained from the National Institutes of Biomedical Innovation, Health, and Nutrition.
Our design and choice for sampling age groups were also similar to the previous studies, which analyzed gene expression during Drosophila aging (Zou et al., 2000; Pletcher et al., 2002), except that we increased the number of samples at the end of the lifespan curve, including very old flies, which allowed us to better examine changes associated with advanced age.
Due to the field conditions, the calculated number of samples was not entirely met; however, the number of cattle in the sampled age-group in the 24 sampled herds was also lower than estimated (2400), so this was evaluated as adequate.
20 The two surveys are not directly comparable, due to differences in the target population, sampling, size of sample and age group.
