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However, we believe the potential for differential recall is more apt to be related to the nature of the reference date as opposed to time between the reference date and the interview date.
The final multivariate model was adjusted for ethnicity, household income, father's or mother's education, type and year of construction of residence, and time between the reference date and interview.
Because of the longer time period involved in identifying, enrolling, and interviewing birth certificate controls in the main study, the time between the reference date and dust collection was less for cases {median [interquartile range (IQR)] years: cases, 0.96 (0.76–1.38); controls, 1.55 (1.24–1.97)}.
Because of the longer time needed to enroll birth certificate controls in the main study, the time between the reference date and dust collection was shorter for cases [median years, interquartile range (IQR): 0.92 (0.74–1.26] than for controls [1.66 (1.26–2.24)].
p-Values are presented from the Wald trend test for ordinal variables (e.g., income, education, year of construction of residence, time between the reference date and interview) and continuous variables (e.g., age) and from the likelihood ratio test for nominal variables (e.g., ethnicity, type of residence).
These findings were supported by multivariable Poisson regression models that demonstrated that household income, ethnicity, parental education, type and year of construction of residence, and time between the reference date and interview were significant independent predictors of the number of products found in the home.
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When comparing non-CDI patients with control patients, we also corrected for the time between admission and the reference date.
While the differences for the two main field models in Figure 6 only reflect the SV between 2014.0 and 2015.0 (the reference date for the IGRF), some significant differences between parent SV models appear above SH degree 8 (not shown in Figure 6).
This reference point will hereafter be referred to as the reference date.
Information concerning the initial characteristics of the breast cancer and the radiotherapy, chemotherapy and hormonal therapy received between the breast cancer diagnosis and the reference date was collected from technical and medical records for each case and control.
There was no evidence of any difference in CD4+ cell counts between cases and controls in any time period before the reference date.
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