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In the 1984 and 1992 surveys, frequency of alcohol consumption was measured with the following question: How often do you usually have any kind of beverage containing alcohol, whether it is wine, beer, whiskey, or any other drink?
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In the national sample surveyed, frequency of ice use increased from fortnightly to close to weekly.
Survey frequency varied from annual (11 surveys) to every 5 years (3 surveys).
The measured change has to be bigger than the error produced by the measurements, or in other words, one must choose the survey parameters based on the rate of change of the landslide compared to the field survey frequency for significant results.
For the quantitative survey, frequency tables were generated for relevant variables.
To benefit from answers by experts who abandoned the questionnaire during the course of the survey, frequency distributions were based on N = 159 for the first and N = 77 for the second round, with valid n calculated for each questionnaire item.
Following the second and last round of the survey, the experts received a link to the survey software to view frequency distributions and comments of the second round.
In our health survey, frequencies of most of the medical conditions diminished significantly as the effort increased, while sociodemographic characteristics stayed stable except for household size, which is expectedly correlated with contact rate, 7 employment status and income.
In the telephone surveys, application frequency was reported as use during the warm and cool seasons and these frequencies were summed to obtain frequency of use per year and average use per 3-month period.
For the other surveys, the frequency of intercourse had to be estimated indirectly on the basis of the duration since last intercourse.
To complement the results obtained with surveys, the frequency of a health condition can be estimated based on the secondary analysis of administrative healthcare databases [ 19].
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CEO of Professional Science Editing for Scientists @ prosciediting.com