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The differences in the survey time and test time are controlled for by including the dummies for quarters of survey time in regressions.
The use of standard units of measurement as well as the consideration of partakers in meals and of seasonality generates significant differences in the survey results.
Mann Whitney U tests were performed to compare sex differences in the survey and 3D scan data, along with descriptive and qualitative analyses.
Differences in the survey methods (paper questionnaires in the SCCSS and telephone interviews in the SHS) may have influenced replies.
Overall, there were regional differences in the survey response rate: 31.1% of nephrologists from the 'more PD' areas answered, compared with only 19.0% in the 'less PD' regions.
Despite age differences in the survey respondents, the prevalence of overweight, high cholesterol and diabetes mellitus appeared to have decreased, with a greater decrease among women than men.
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Part of the difference in values may be due to methodological differences in the surveys.
If there are significant differences in the surveys to be found, they frequently suggest that whites, particularly white youth, are more likely to engage in drug crime than people of color".
With the use of IPUMS data, the differences in the surveys' definitions of occupations over time are resolved.
Whether this is due to methodological differences in the surveys or represents a real phenomenon is not clear.
Data were weighted to account for different probabilities of selection of each household and the number of adults in each household and to account for differences in the surveyed population compared with the general population.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com