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From a methodological perspective, an ideal COI study would clearly describe the perspective of analysis and, hence, the cost items (direct or indirect), cost collection procedure, discounting, quality of data, time frame of analysis, related comorbidities, and robust sensitivity analysis for all the assumptions.
The second limitation is the data time frame.
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org/ReportsPortal/public/dataRequest.do and then enter information on the study purpose, the researchers involved, any grants covering the research and the specific data requested* specifically the data elements, time frame and file format.
Approximately one-fourth of the target population had comprehensive oral examination data available during the 5-year data collection time frame.
Further sensitivity analyses that restricted the analytical sample to only the 7,156 subjects who resided in the study area for ≥1 year during the data collection time frame yielded nearly identical results (data not shown).
However, depending on the research question, the particular system at hand, and the available data, the time frame selected for investigation may vary.
A regression model based on measured data should be able to predict energy performance of a building for a given day as long as the weather conditions are similar to those during the data collection time frame.
The index of completeness of case ascertainment quantifies the percentage of actual incident cancer cases that are reported by a registry within the data submission time frame.
The Delphi panel size of at least 8 respondents was in line with recommendations that the membership number be relevant to the purpose of the study, the selected design, and data collection time frame [ 12, 13].
Using convenience sampling [ 26], research personnel identified all potential participants presenting to the out-patient department of the hospital within the data collection time frame (January, May and June of 2009).
Other limitations associated with the present study are the inherent bias (over reporting or underreporting) in self-report and the limited data collection time frame for the consumption and drinking frequency of alcoholic beverages.
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