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Evaluating the quality of dietary intake validation studies.
Lluis Serra-Majem1, Lene Frost Andersen, Patricia Henríque-Sánchez
1Nutrition Research Group, Department of Clinical Sciences, Centre for Health Sciences, University of Las Palmas de Gran Canaria, 35080 Las Palmas de Gran Canaria, Spain. lserra@dcc.ulpgc.es
The British Journal of Nutrition
|January 27, 2010
Summary
A new scoring system was developed to evaluate dietary intake validation studies. This quality assessment is crucial for interpreting results in nutritional epidemiology, especially for micronutrient intake correlations.
Area of Science:
- Nutritional Epidemiology
- Dietary Assessment Methods
Background:
- Assessing the quality of dietary intake validation studies is essential for reliable nutritional epidemiology.
- Previous methods lacked a standardized approach to quality assessment and its impact on correlation coefficients.
Purpose of the Study:
- To develop and validate a scoring system for assessing the quality of dietary intake validation studies.
- To evaluate the impact of study quality on correlation coefficients for micronutrient intake.
Main Methods:
- A three-step scoring system was developed, considering sample size, statistics, data collection, seasonality, and supplement use.
- The system was applied to 124 vitamin intake validation studies.
- Correlation coefficients were adjusted based on quality scores.
Main Results:
- Only 5.6% of studies were rated as very good quality, while 41.9% were good quality.
- After adjusting for quality, the percentage of poor or very good correlation values increased.
- Mean correlations for vitamins A, C, D, and E remained similar after adjustment.
Conclusions:
- The developed scoring system effectively assesses the quality of dietary intake validation studies.
- Study quality significantly influences the interpretation of correlation coefficients for micronutrient intake.
- Incorporating quality assessment is vital for accurate interpretation in nutritional epidemiology.
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