Document Detail

Refinement and validation of an FFQ developed to estimate macro- and micronutrient intakes in a south Indian population.
MedLine Citation:
PMID:  18325134     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Potential error sources in nutrient estimation with the FFQ include inaccurate or biased recall and overestimation or underestimation of intake due to too many or too few items on the FFQ, respectively. Here we report the refinement of an FFQ that overestimated nutrient intake and its validation against multiple 24 h recalls. STUDY DESIGN: Data on 2527 participants in south India (Trivandrum) were available for the original FFQ (OFFQ) that overestimated nutrient intake (132 food items). After excluding participants with implausible energy intake estimates (<2.72 MJ/d (<650 kcal/d), >15.69 MJ/d (>3750 kcal/d)) we ran stepwise regression analyses with selected nutrients as the outcomes and food intake (servings/d) as predictor variables (n 1867). From these results and expert consultation we refined the FFQ (RFFQ), and validated it by comparing intakes obtained with it and the mean of two 24 h recalls among 100 participants. RESULTS: The OFFQ overestimated usual daily nutrient intake before and after exclusions [for energy: 13.39 (sd 5.46) MJ (3201 (sd 1305) kcal) and 10.96 (sd 2.65) MJ (2619 (sd 634) kcal), respectively]. In stepwise analyses, fifty-seven food items explained 90 % of the variance in nutrients; we retained thirteen food items because participants consumed them at least twice monthly and twelve food items that local nutritionists recommended. Mean energy intake estimated from the RFFQ (eighty-two food items) was 7.94 (sd 2.05) MJ (1897 (sd 489) kcal). The de-attenuated correlations between mean 24 h recall and RFFQ intakes ranged from 0.25 (vitamin A) to 0.82 (fat). CONCLUSION: We refined an FFQ that overestimated nutrient intake by shortening and redesigning, and validated it by comparisons with 24 h dietary recall data.
Romaina Iqbal; Kamalasanan Ajayan; Ankalmadagu V Bharathi; Xiaohe Zhang; Shofiqul Islam; Chitthakkudam R Soman; Anwar T Merchant
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Validation Studies     Date:  2008-03-07
Journal Detail:
Title:  Public health nutrition     Volume:  12     ISSN:  1368-9800     ISO Abbreviation:  Public Health Nutr     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-12-17     Completed Date:  2009-02-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9808463     Medline TA:  Public Health Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  12-8     Citation Subset:  IM    
Department of Community Health Sciences, Aga Khan University, Karachi, Pakistan.
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MeSH Terms
Cohort Studies
Diet / ethnology*
Epidemiologic Studies
Interviews as Topic
Middle Aged
Nutrition Surveys*
Pilot Projects
Regression Analysis

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