Reproducibility of a food frequency questionnaire in koreans.
Article
in English
| IMSEAR
| ID: sea-37828
ABSTRACT
Objective:
The present study was conducted to report upon the reproducibility of a 98-item food frequency questionnaire among Koreans.Subjects:
The study subjects were recruited from among those who visited for a regular health check-up at the health centers from Samsung Hospital and Hallym University Hospital.Setting:
The FFQ was administered first in April to June of 2002 to 145 Korean adults aged 40 and over residing in Seoul and its vicinity and was then re-administered to 126 three months later between July and September of 2002 (FFQ 1 and FFQ 2).Methods:
Reproducibility was evaluated using the Pearson correlation coefficients of log-e and the calorie-adjusted nutrient score. Weighted kappa (k) statistics with 95% confidence limits were calculated to assess the chance adjusted level of agreement between the FFQ 1 and the FFQ 2. The proportions of correctly categorized subjects in the same or adjacent quintiles were calculated.Results:
The average intake in FFQ 1 was no more than 12 percent different from the average intake in FFQ 2. Correlations varied between 0.47 for sodium and 0.72 for vitamin C. All k values exceeded 0.5 except that of fiber. The average k for all nutrients was 0.67. The percentage agreement varied from 62% for energy and potassium to 82% for vitamin B(2) and cholesterol. The average of the agreement was 72%.Conclusion:
The results of this study verify that it is possible to use tailored, relatively simple, but comprehensive, self-administered food frequency questionnaires to study nutrient consumption in large-scale epidemiological studies.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Main subject:
Aged
/
Female
/
Humans
/
Male
/
Surveys and Questionnaires
/
Regression Analysis
/
Reproducibility of Results
/
Adult
/
Eating
/
Korea
Type of study:
Diagnostic study
/
Evaluation studies
Country/Region as subject:
Asia
Language:
English
Year:
2003
Type:
Article
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