In addition, the UMDES includes a referent population from an area of Michigan in which there are no unusual sources of dioxin exposure and from which inferences regarding the general Michigan population can be derived.
The referent model for PM10 included only an intercept, α, and a smooth function for time trend, h(t), as fixed-effects (Supporting Information Table S1), and did not include a smooth spatial term g(s i ).
In contemporary discussions, such contents are also called singular contents, because they include the referent of a singular term itself rather than a description that picks out different objects depending on which thing in the world satisfies it.
Beane Freeman et al. (2009) examined associations with formaldehyde in the NCI industrial worker cohort by peak exposure, average intensity, cumulative exposure, cumulative number of peaks ≥4.0 ppm (data not reported), and duration of exposure (data not reported), years since first exposure, and years since first exposure ≥4 ppm, including and excluding a referent group with no exposure.
We draw inferences about the methodology created including: a) justification of its development; b) the representativeness and scope of its referents; c) an assessment of the components included in its developmental structure, and d) potential advantages and scenarios for its application.
The TEHC first conducted health surveys on the residents, including the referent population, 1.5 years after the spill, establishing a cohort.
Likewise, an omnibus test of scalar invariance suggested that the eight metric-invariant SF-36 subscales (including the referent subscale) had different intercepts for the VETERAN and DOPPS samples, according to the likelihood-ratio test (unadjusted p <.000001, Bonferroni-adjusted p <.00005).
According to the likelihood-ratio test (unadjusted p <.000001, Bonferroni-adjusted p <.00005), an omnibus test of scalar invariance suggested that the five metric-invariant KDCS subscales (including the referent subscale) had different intercepts for the VETERAN and DOPPS samples (see Table 3, Model 11).
The selection of a referent group that included conceptions 1 year prior and 1 year after the exposure of interest was intended to control for both seasonal variations and annual temporal trends in the outcomes of interest.
A total of 6,765 subjects were included in the referent cohort with baseline diagnoses that included respiratory or skin infections, sprains, strains, dislocations and fractures, superficial injuries and burns.
