Abstract
This study evaluated the validity and reliability of applying a newly developed dish-based, semi-quantitative food frequency questionnaire (FFQ) for Korean diet and cancer research. The subjects in the present study were 288 Korean adults over 30 years of age who had completed two FFQs and four 3-day diet records (DRs) from May 2008 to February 2009. Student's t-tests, Chi-square tests, and Spearman's rank correlation coefficients were used to estimate and compare intakes from different dietary assessment tools. Agreement in quintiles was calculated to validate agreement between the results of the second FFQ (FFQ-2) conducted in February 2009 and the DRs. Median Spearman's correlation coefficients between the intake of nutrients and foods assessed by the FFQ-1 and FFQ-2 were 0.59 and 0.57, respectively, and the coefficients between the intake of nutrients and foods assessed by the FFQ-2 and the DRs were 0.31 and 0.29, respectively. The quintile classifications of same or adjacent quintile for intake of nutrients and foods were 64% and 65%, respectively. Misclassification into opposite quintiles occurred in less than 5% for all dietary factors. Thus this newly-developed, Korean dish-based FFQ demonstrated moderate correspondence with the four 3-day DRs. Its reliability and validity are comparable to those reported in other studies.
Highlights
Cancer prevention research has been a primary focus of global health research (Bode & Dong, 2009)
The four 3-day diet records (DRs) were obtained from the sample of 288 adults (115 men and 173 women)
The four 3-day DRs indicated the consumption of a variety of dishes and seasonal foods by the subjects
Summary
Cancer prevention research has been a primary focus of global health research (Bode & Dong, 2009). Many cohort research findings emphasize that environmental and lifestyle risk factors are preventable for reducing the large and increasing burden of cancers worldwide (Danaei et al, 2005). Nutrition has long been known to be a major risk factor in cancer etiology (Doll & Peto, 1981), elucidating the relationship between diet and disease has been challenging, largely due to the multiple causes of cancer and complex dietary behavior. Min Kyung Park et al we assessed the validity and reliability of a dish-based, semi-quantitative FFQ for diet and cancer research by comparing the results with 3-day DRs over four seasons in a sample of Korean adults over 30 years of age
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