However, concerns have been raised as to whether metabolites measured in a single spot sample accurately reflect exposure for the full day or beyond.
Melosh's team also found that when they sampled from a group of cells day after day, certain molecules that should be present at constant levels remained the same, indicating that their sampling accurately reflected the cell's interior.
If you want a survey that accurately represents the views of the modern electorate, controlling for the percentage of cellphone-only users is just as important as making sure your sample accurately reflects gender, race and education breakdowns of the broader population.
This confirmed that the measure of 11β-HSD1 activity obtained via a mid-morning urine sample accurately reflected daily 11β-HSD1 activity.
Data in each survey were weighted by age group, sex, geographical area, and household size to the Estimated Residential Population [ 17] aged 18 years and over to account for different probabilities of selection and response rates among different demographic groups, thus ensuring that the sample accurately reflected the South Australian adult population.
Given the long half-life of DDT and DDE and the high correlation among DDE levels measured at different times during gestation (Longnecker et al. 1999), these serum samples should accurately reflect body burdens over the entire pregnancy.
As prevalence among such samples may not accurately reflect prevalence in wider populations and small sample sizes would confer very wide confidence intervals on prevalence estimates, it was not possible to compare prevalence across geographic locations, hosts, or disease states with any certainty.
Therefore, later samples could more accurately reflect the CTC status by including CTC release, proliferation, apoptosis, and necrosis.
Pyrethroids are nonpersistent and thus rapidly metabolized in the body, so the use of single spot urine samples may not accurately reflect typical exposure levels.
Also, the costs of preparing grants were elicited from a small sample of researchers based at two institutions, and a nationally representative sample would more accurately reflect costs.
