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Quality control of dietary data collection in the CARDIA study
J E Hilner1, A McDonald, L Van Horn
1CARDIA Coordinating Center, University of Alabama, Birmingham 35205.
Insights
The Coronary Artery Risk Development in (Young) Adults (CARDIA) Study ensured high-quality dietary data through rigorous quality control. This resulted in accurate data collection for nutritional analysis in the CARDIA study.
Area of Science:
- Epidemiology
- Nutrition Science
- Public Health
Background:
- Dietary data quality is crucial for epidemiological studies.
- Misclassification of dietary intake can bias results in observational studies.
- The Coronary Artery Risk Development in (Young) Adults (CARDIA) Study aimed to ensure dietary data accuracy.
Purpose of the Study:
- To describe the quality control (QC) measures implemented in the CARDIA Study for dietary data.
- To assess the accuracy and completeness of dietary data collected.
- To ensure the reliability of dietary information for subsequent analyses.
Main Methods:
- Implemented manual and automated data inspection for quality monitoring.
- Reviewed 717 dietary forms and audiotaped 153 interviews for error assessment.
- Calculated form completion error rates and discrepancy rates between recording methods.
Main Results:
- Overall form completion error rate was 0.22%, with a critical error rate of 0.12%.
- The proportion of error-free forms increased significantly over time (p < 0.0001).
- Discrepancy rate between recording and interviewing methods was 0.7%, indicating high reliability.
Conclusions:
- The implemented QC measures effectively minimized misclassification of dietary data.
- Dietary data collected in the CARDIA Study were complete and accurate.
- The findings support the use of CARDIA dietary data for robust nutritional and epidemiological analyses.
Abstract:
The Coronary Artery Risk Development in (Young) Adults (CARDIA) Study developed and implemented quality control (QC) measures to minimize misclassification associated with dietary data. Manual and automated data inspection were used to monitor quality. Of the 5111 participants who completed a dietary history, 717 (14%) had dietary forms reviewed and 153 (3%) had the interview audiotaped. Results show that for the 717 forms reviewed, the overall form completion error rate was 0.22% and the "critical" error rate (i.e., those errors impacting on nutrient computations) was 0.12%. The proportion of forms free of any type of error increased over time (p less than 0.0001). The discrepancy rate in recording and interviewing methods as estimated from the 153 audiotaped interviews was 0.7%. Inter-interviewer differences were small as indicated by the audiotaped interviews and the proportion of error-free forms completed by interviewers. The results indicate that the dietary data collected in CARDIA were completely and accurately recorded for use in analysis.