The monoclonal immunoassay showed excellent within-person variability
, however as we have shown previously this assay is biased by genotype (10, 11); thus results for this assay should be interpreted with caution.
was not significantly different between age groups in verbal working memory ([F.sub.(1,23)] = 1.05; P = .749; [[eta].sup.2] = .005), nor in resistance to interference (F[F.sub.(1,23)] = 0.135; P = .717; [[eta].sup.2] = .006).
The result is that total within-person variability
(used in the calculation of reliability coefficient) is substantially greater than average within-person variability
in urinary bisphenol A concentrations:
in urinary bisphenol A concentrations: measurements from specimens after long-term frozen storage.
(2005) reported that within-person variability
in urine concentrations of the OP metabolite 3,5,6-trichloro-2-pyridinol (TCPy) was five times higher than between-person variability with multiple measurements taken over 3 consecutive months.
The LSC, calculated from the within-person variability
and the analytical imprecision, for DPD results was 70.3%.
For DPP, which did not perform as well in the ICC analysis compared with BDCPP, this may indicate that there may be significant within-person variability
in concentrations over time, but that DPP concentrations among the most highly exposed individuals tend to remain among the highest relative to other individuals over the course of 3 months.
The ICC is calculated as the ratio of between-person variability to total variability (total variability = between-person + within-person variability
Accordingly, both analytical and within-person variability
, but particularly the latter, increase measurement uncertainty and, therefore, the potential for clinical misinterpretation at ADA-specified [HbA.sub.1c] thresholds.
Variations in the patterns of food consumption may contribute to the within-person variability
of phthalate and BPA exposure, while patterns of personal care product use and movement between environments with variable air and dust concentrations may create additional within-person variability
of phthalate exposure (Adibi et al.
Data on the within-person variability
in tHcy concentrations are still sparse [17, 18], despite the fact that such knowledge is essential for accurate assessment of risk factor associations with disease.