Even the best exposure biomarkers are imprecise measures of MeHg in target organs such as the fetal brain.
Although the toenail mercury appears to be a better risk indicator than other biomarkers, single mercury concentrations are imprecise measures of long-term exposure and will therefore result in an underestimated assessment of MeHg toxicity.
However, it should be noted that both the categorisation of foods by the nutrient profile model and the categorisation of diets by the dietary quality index are imprecise measures of 'healthiness', which could introduce error into the results.
To be sure, arrests can be an imprecise measure of enforcement efforts, especially when they are being underwritten by a huge infusion of overtime money, as they are this year.
Though we included race/ethnicity, geographic region of residence, and number of moles on lower leg in our multivariable regression models, these factors are likely imprecise measures of sun exposure and some residual confounding may persist.
This is not unusual for a biomarker study (e.g., McDowell et al. 2004), but it does suggest that, for MeHg, dietary recall data can be an imprecise measure of exposure.
This would imply that our current parameters for iron deficiency, TSAT and ferritin, may be insensitive and imprecise measures of iron availability to the bone marrow.
This is an imprecise measure of when a president is working, of course; he might take meetings after hours or review documents that are pertinent to his job.
Although controlling for gestational weight gain in epidemiologic studies of associations between prenatal exposures to lipophilic persistent organic pollutants such as PCBs and birth weight is important, because gestational weight gain is an imprecise measure of the increased maternal lipid compartment during pregnancy, such adjustment will not completely remove the bias.
