Cristina Palacios1, Maria Angelica Trak2, Jesmari Betancourt1, Kaumudi Joshipura2, Katherine L Tucker3. 1. 1Nutrition Program,Graduate School of Public Health,Medical Sciences Campus,University of Puerto Rico,San Juan,PR 00935. 2. 2Center for Clinical Research and Health Promotion,School of Dental Medicine,Medical Sciences Campus,University of Puerto Rico,San Juan,Puerto Rico. 3. 3Department of Clinical Laboratory & Nutritional Sciences,University of Massachusetts at Lowell,Boston,MA,USA.
Abstract
OBJECTIVE: We aimed to assess the relative validity and reproducibility of a semi-quantitative FFQ in Puerto Rican adults. DESIGN: Participants completed an FFQ, followed by a 6 d food record and a second administration of the FFQ, 30 d later. All nutrients were log transformed and adjusted for energy intake. Statistical analyses included correlations, paired t tests, cross-classification and Bland-Altman plots. SETTING: Medical Sciences Campus, University of Puerto Rico. SUBJECTS: Convenience sample of students, employees and faculty members (n 100, ≥21 years). Data were collected in 2010. RESULTS: A total of ninety-two participants completed the study. Most were young overweight females. All nutrients were significantly correlated between the two FFQ, with an average correlation of 0·61 (range 0·43-0·73) and an average difference of 4·8 % between them. Most energy-adjusted nutrients showed significant correlations between the FFQ and food record, which improved with de-attenuation and averaged 0·38 (range 0·11-0·63). The lowest non-significant correlations (≤0·20) were for trans-fat, n 3 fatty acids, thiamin and vitamin E. Intakes assessed by the FFQ were higher than those from the food record by a mean of 19 % (range 4-44 %). Bland-Altman plots showed that there was a systematic trend towards higher estimates with the FFQ, particularly for energy, carbohydrate and Ca. Most participants were correctly classified into the same or adjacent quintile (average 66 %) by both methods with only 3 % gross misclassification. CONCLUSIONS: This semi-quantitative FFQ is a tool that offers relatively valid and reproducible estimates of energy and certain nutrients in this group of mostly female Puerto Ricans.
OBJECTIVE: We aimed to assess the relative validity and reproducibility of a semi-quantitative FFQ in Puerto Rican adults. DESIGN:Participants completed an FFQ, followed by a 6 d food record and a second administration of the FFQ, 30 d later. All nutrients were log transformed and adjusted for energy intake. Statistical analyses included correlations, paired t tests, cross-classification and Bland-Altman plots. SETTING: Medical Sciences Campus, University of Puerto Rico. SUBJECTS: Convenience sample of students, employees and faculty members (n 100, ≥21 years). Data were collected in 2010. RESULTS: A total of ninety-two participants completed the study. Most were young overweight females. All nutrients were significantly correlated between the two FFQ, with an average correlation of 0·61 (range 0·43-0·73) and an average difference of 4·8 % between them. Most energy-adjusted nutrients showed significant correlations between the FFQ and food record, which improved with de-attenuation and averaged 0·38 (range 0·11-0·63). The lowest non-significant correlations (≤0·20) were for trans-fat, n 3 fatty acids, thiamin and vitamin E. Intakes assessed by the FFQ were higher than those from the food record by a mean of 19 % (range 4-44 %). Bland-Altman plots showed that there was a systematic trend towards higher estimates with the FFQ, particularly for energy, carbohydrate and Ca. Most participants were correctly classified into the same or adjacent quintile (average 66 %) by both methods with only 3 % gross misclassification. CONCLUSIONS: This semi-quantitative FFQ is a tool that offers relatively valid and reproducible estimates of energy and certain nutrients in this group of mostly female Puerto Ricans.
Entities:
Keywords:
FFQ; Food records; Puerto Rico; Reproducibility; Validation
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