Relative Validity and Reproducibility of a Food Frequency Questionnaire to Assess Food Group Intake in Pregnant Jordanian Women |
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| Institution: | 2. TPG/Glotech, Rockville, Maryland;3. Department of Nutritional Sciences, School of Health Professions, Rutgers University, Newark, New Jersey;4. National Institutes of Health Graduate Partnerships Program, Bethesda, Maryland;5. Department of Public Health Sciences, Clemson University, Clemson, South Carolina;7. Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles, California;11. Department of Epidemiology Research, Center for Fetal Programming, Statens Serum Institut, Copenhagen, Denmark;12. Department of Endocrinology-Diabetes and Bone-metabolic Research Unit, Rigshospitalet, Copenhagen, Denmark;8. Cardiovascular and Metabolic Disease (CVMD) Translational Medicine Unit, Early Clinical Development, IMED Biotech Unit, AstraZeneca, Gothenburg, Sweden;9. Division of Research, Kaiser Permanente Northern California, Oakland, California;71. Department of Epidemiology and Biostatistics, University of California, San Francisco, California;112. Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China;123. Department of Obstetrics, Center for Pregnant Women with Diabetes, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark;84. Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, Massachusetts |
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| Abstract: | BackgroundResearch on the relationship between maternal diet and pregnancy outcomes requires valid dietary assessment tools in pregnancy.ObjectiveThis study aimed to develop and examine the relative validity and reproducibility of a quantitative food frequency questionnaire (FFQ) to estimate food group intake in a sample of pregnant Jordanian women.DesignIn this validation study, food group intake from a culturally sensitive quantitative FFQ was compared with food group intake from three 24-hour dietary recalls.Participants and settingThe validation study was conducted from 2015 to 2017 at the maternity clinics in Jordan University Hospital among 131 healthy singleton pregnant Jordanian women. Of these women, 30 also took part in the reproducibility phase, which involved repeated completion of the FFQ in a time frame of 1 month. Pregnant women who had gestational diabetes, preeclampsia, and chronic diseases were excluded.Main outcome measuresRelative validity and reproducibility of a 117-item quantitative FFQ used to estimate usual food intake over a period of 1 month.Statistical analyses performedIntraclass correlation coefficients and weighted κ statistics were calculated to test the reproducibility between the two administrations of the FFQ. Pearson correlations were estimated to validate the FFQ against 24-hour dietary recalls. Cross-classification and Bland-Altman plots were used to examine the agreement between the two dietary assessment methods.ResultsThe intraclass correlation coefficients between the two FFQs ranged from 0.24 for legumes to 0.93 for processed meats. A moderate level of agreement was observed between two FFQs. De-attenuated and energy-adjusted correlations ranged from 0.08 for sweets and sugar to 0.93 for sugary drinks. On average, 50.9% and 45.2% of participants were classified by the FFQ and the 24-hour dietary recalls into the same quartile based on their crude and energy-adjusted food group intake, respectively. Bland-Altman plots showed satisfactory agreement between two methods for most food groups.ConclusionsThe FFQ showed moderate reproducibility and good relative validity for most food groups. |
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| Keywords: | Validity Reproducibility Food groups Food frequency questionnaire 24-Hour dietary recalls |
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