Thus, mortality studies investigating diseases with low fatality rates, such as CLL, are likely to miss exposure effects because of poor ascertainment of cases and competing causes of death.
The results for single International Standard Industrial Classification of All Economic Activities and International Standard Classification of Occupations codes not included in list A or B should be regarded as suggestive because of poor sensitivity and specificity in defining exposures (15, 19) and multiple comparison issues (78).
Senior citizens are at risk for vitamin D deficiency because of poor dietary vitamin D intake and decreased exposure to sunlight.
Studies report that residential use of pesticides in low-income homes is common because of poor housing conditions and pest infestations; however, exposure data on contemporary-use pesticides in low-income households is limited.
In addition, urban poor populations are more disadvantaged in terms of exposure to air pollution because of poor housing structures, close proximity to air pollution sources and the types of fuel used for cooking.
There's a history of foreign automakers — Hyundai, for instance — stumbling upon their first exposure to American consumers, usually because of poor quality.
For example, low-income children may experience higher exposures to pesticides, particularly pyrethroids, because of poor housing quality and associated pest infestations and home pesticide use (Bradman et al. 2005a; Quirós-Alcalá et al. 2011; Whyatt et al. 2002).
Candidate biomarkers often lack diagnostic utility because of poor sensitivity (false negatives) and/or inadequate specificity (false positives) derived from confounding exposures, nonspecific biomarkers or individual variability.
Although the number of previous maternal pregnancies could be a better measure of prenatal estrogen exposure than live birth order, we could not assess this because of poor data quality on the birth records.
