scholarly journals Assessing the validity of a food frequency questionnaire among low-income women in São Paulo, southeastern Brazil

2010 ◽  
Vol 26 (11) ◽  
pp. 2059-2067 ◽  
Author(s):  
Marly Augusto Cardoso ◽  
Luciana Yuki Tomita ◽  
Elaine Cristina Laguna
Keyword(s):  
Low Income ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Sao Paulo ◽  
Southeastern Brazil ◽  
São Paulo ◽  
Food Frequency ◽  
Low Income Women

This study describes the validity of a food frequency questionnaire (FFQ) in 93 low-income women (20-65 years), participating in a case-control study in São Paulo, Brazil. Two FFQ (FFQ1 and FFQ2, 12 months apart) and three 24-hour dietary recalls (24hR) were conducted between 2003 and 2004 to estimate dietary intake during the past year. The Pearson correlation coefficients (crude, energy-adjusted and de-attenuated) were used for comparisons between FFQ and 24hR. The agreement between the methods was further examined by the Bland-Altman analysis. For the assessment of long-term reliability, the energy-adjusted intra-class correlation coefficients were mostly around 0.40, but higher for vitamin A and folate (0.50-0.56). Energy-adjusted, attenuation-corrected Pearson validity correlations between FFQ and DR ranged from 0.30-0.54 for macronutrients to 0.20-0.48 for micronutrients, with higher value for calcium (0.75). There were small proportions of grossly misclassified nutrient intakes, while Bland-Altman plots indicated that the FFQ is accurate in assessing nutrient intake at a group level.

scholarly journals Reproducibility and validity of a food-frequency questionnaire for use among low-income Brazilian workers

2003 ◽  
Vol 6 (8) ◽  
pp. 821-827 ◽  
Author(s):  
Nélida Schmid Fornés ◽  
Maria Luiza Ferreira Stringhini ◽  
Berenice Müller Elias
Keyword(s):  
Vitamin C ◽  
Total Energy ◽  
Low Income ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Nutrient Intakes ◽  
Low Literacy ◽  
Food Frequency

AbstractObjectives:To assess the reproducibility and validity a 127-item, habitual intake, food-frequency questionnaire (FFQ), developed for low-income and low-literacy Brazilian workers, by comparison with a 24-hour dietary recall (24-HDR).Design:The FFQ and 24-HDR were interviewer-administered at the local workplace to each subject twice, with a period of 6 months between estimates; and four 24-HDRs were conducted during the 4-month period between the two FFQs (FFQ1 and FFQ2). Reproducibility was tested by comparing mean nutrient intakes from the two FFQs. Validity was determined by comparing the mean nutrient intakes from the FFQs with the corresponding averages of the six 24-HDRs (reference method).Setting:Goiânia City, in Central West Brazil.Subjects:The study was based on 104 (62 women and 42 men) subjects, aged 18 to 60 years, who were randomly selected.Results:Dietary intake from the FFQ was higher than from the 24-HDR. Reproducibility was assessed by Pearson correlation coefficients for nutrients from FFQ1 and FFQ2, and ranged from 0.23 for retinol to 0.69 for total energy (mean 0.52). Intra-class coefficients for nutrients averaged by the 24-HDRs ranged from 0.29 for vitamin C to 0.76 for total energy; retinol was not significant. In the validation study, correlation between the FFQ and the 24-HDR ranged between 0.21 for vitamin C and 0.70 for total energy (mean 0.50). Adjusting for total energy lowered the coefficients, except for calcium, retinol and vitamin C. Coefficients increased with attenuation, ranging from 0.35 for carbohydrate to 0.65 for calcium.Conclusions:Results indicate that this questionnaire had satisfactory reproducibility and reasonable validity.

scholarly journals Validity and reproducibility of a semi-quantitative multiple-choice food frequency questionnaire in adults living in central Iran

2020 ◽  
Author(s):  
Alireza Zimorovat ◽  
Fatemeh Moghtaderi ◽  
Mojgan Amiri ◽  
Hamidreza Raeisi-Dehkordi ◽  
Matin Mohyadini ◽  
...  
Keyword(s):  
Vitamin A ◽  
Vitamin C ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Multiple Choice ◽  
Correlation Coefficients ◽  
Central Iran ◽  
Food Frequency ◽  
Calcium Magnesium

Abstract Background: To the best of our knowledge, no study has tried to develop and validate a multiple-choice food-based FFQ in Iran using weighed dietary records.This study aimed to investigate the validity and reproducibility of a multiple-choice semi-quantitative food frequency questionnaire (SQ-FFQ) in adults living in central Iran.Methods: Participants attended a large long-term clinical trial were asked to complete three SQ-FFQs by interview, and nine 3-day weighed dietary records (WDRs), over nine months. They provided two blood samples to assess serum calcium, magnesium, zinc, and vitamin C levels. The Pearson and intraclass correlation coefficients (ICC) were calculated to assess reproducibility and validity. The degree of misclassification was explored by using a contingency table of quartiles which is compare the information between third FFQ and WDRs. The method of triads was incorporated to assess validity coefficients between estimated intakes using third FFQ, WDRs, and biochemical markers and assumed true intakes.Results: A total of 180 adults aged 48.9±8.4 years completed the study. Compared to WDRs, FFQs overestimated all nutrients intakes except for iron. The median Pearson correlation coefficient was 0.31, 0.44, and 0.38 for FFQ1-FFQ2, FFQ1-FFQ3 and FFQ2-FFQ3, respectively and ICC ranged from 0.43 (thiamin) to 0.73 (vitamin D, median: 0.56). The de-attenuated, age, sex, and education adjusted correlation coefficients ranged from 0.01 for vitamin A to 0.40 for vitamin B12 and -0.05 for vitamin A to 0.41 for manganese (median: 0.17 and 0.26) for FFQ1-WDR and FFQ3-WDR, respectively. The median exact agreement and complete disagreement between FFQ3 and WDRs were 33% and 6%, respectively. The FFQ3 validity coefficients for vitamin C, calcium, magnesium, and zinc were 0.13, 0.62, 0.89, and 0.66, respectively, using the triads method.Conclusions: The SQ-FFQ seems to be an acceptable tool to assess the long-term dietary intake for future large-scale studies in this population.

scholarly journals Validity and Reproducibility of a Semi-quantitative Multiple-choice Food Frequency Questionnaire in Adults Living in Central Iran

2020 ◽  
Author(s):  
Alireza Zimorovat ◽  
Fatemeh Moghtaderi ◽  
Mojgan Amiri ◽  
Hamidreza Raeisi-Dehkordi ◽  
Matin Mohyadini ◽  
...  
Keyword(s):  
Vitamin A ◽  
Vitamin C ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Multiple Choice ◽  
Correlation Coefficients ◽  
Central Iran ◽  
Food Frequency ◽  
Calcium Magnesium

Abstract Background: To the best of our knowledge, no study has tried to develop and validate a multiple-choice food-based FFQ in Iran using weighed dietary records.This study aimed to investigate the validity and reproducibility of a multiple-choice semi-quantitative food frequency questionnaire (SQ-FFQ)in adults living in central Iran.Methods: Participants attended a large long-term clinical trial were asked to complete three SQ-FFQs by interview, and nine 3-day weighed dietary records (WDRs), over nine months.They provided two blood samples to assess serum calcium, magnesium, zinc, and vitamin C levels.The Pearson and intraclass correlation coefficients (ICC) were calculated to assess reproducibility and validity. The degree of misclassification was explored by using a contingency table of quartiles which is compare the information between third FFQ and WDRs. The method of triads was incorporated to assess validity coefficients between estimated intakes using third FFQ, WDRs, and biochemical markers and assumed true intakes.Results: A total of180 adults aged 48.9±8.4 years completed the study. Compared to WDRs, FFQs overestimated all nutrients intakes except for iron. The median Pearson correlation coefficient was 0.31, 0.44, and 0.38 for FFQ1-FFQ2, FFQ1-FFQ3 and FFQ2-FFQ3, respectively andICC ranged from 0.43 (thiamin) to 0.73 (vitamin D, median: 0.56). The de-attenuated, age, sex, and education adjusted correlation coefficients ranged from 0.01 for vitamin A to 0.40 for vitamin B12 and -0.05 for vitamin A to 0.41 for manganese (median: 0.17 and 0.26) for FFQ1-WDR and FFQ3-WDR, respectively.The medianexact agreement and complete disagreement between FFQ3 and WDRs were 33% and 6%, respectively.The FFQ3validity coefficientsfor vitamin C, calcium, magnesium, and zinc were 0.13, 0.62, 0.89, and 0.66, respectively, using the triads method.Conclusions: The SQ-FFQseems to be an acceptable tool to assess the long-term dietary intake for future large-scale studies in this population.

scholarly journals Validity and reproducibility of a food frequency questionnaire for adults of São Paulo, Brazil

2014 ◽  
Vol 17 (4) ◽  
pp. 852-859 ◽  
Author(s):  
Soraya Sant'Ana de Castro Selem ◽  
Aline Martins de Carvalho ◽  
Eliseu Verly-Junior ◽  
Jackeline Venâncio Carlos ◽  
Juliana Araujo Teixeira ◽  
...  
Keyword(s):  
Food Consumption ◽  
Food Frequency Questionnaire ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Weighted Kappa ◽  
Sao Paulo ◽  
São Paulo ◽  
Polyunsaturated Fat ◽  
Food Frequency

OBJECTIVES: To assess the validity and reproducibility of a food frequency questionnaire developed for estimating the food consumption of adults in São Paulo, Brazil, based population study. METHODS: A sample of individuals aged above 20 years, of both genders, living in São Paulo, was used for the validation study (n = 77) and reproducibility study (n = 74) of the food frequency questionnaire. To verify the validity and reproducibility of energy and 19 nutrients were applied two food frequency questionnaires (60 items) and three 24-hour dietary recalls (24HR - reference method). The validity was verified by Spearman correlation coefficient (crude and de-attenuated) and weighted Kappa, and reproducibility by intraclass correlation coefficients and weighted kappa. RESULTS: In analyzes of validity de-attenuated correlation coefficients ranged from 0.21 (carbohydrate) to 0.74 (energy), and weighted kappa exceeded 0.40 for 30% of the nutrients. Polyunsaturated fat and folate did not show significant correlation and weighted kappa. In reproducibility correlation coefficients ranged from 0.36 (polyunsaturated fat) to 0.69 (calcium), and weighted kappa exceeded 0.40 for 80% of the nutrients. CONCLUSION: The food frequency questionnaire analyzed has good validity and reproducibility for estimating the food consumption of adults in São Paulo compared to the reference method, so it is an appropriate instrument to be used in epidemiological studies on similar populations. Estimates of polyunsaturated fat and folate should be interpreted with caution.

scholarly journals Development and validation of a food frequency questionnaire (FFQ-Porto Alegre) for adolescent, adult and elderly populations from Southern Brazil

2010 ◽  
Vol 26 (11) ◽  
pp. 2068-2079 ◽  
Author(s):  
Ruth Liane Henn ◽  
Sandra Costa Fuchs ◽  
Leila Beltrami Moreira ◽  
Flavio Danni Fuchs
Keyword(s):  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
The Elderly ◽  
Population Based ◽  
Porto Alegre ◽  
Food Frequency ◽  
Dietary Recall ◽  
Epidemiological Surveys ◽  
Adolescents And Adults

This study assessed the validity of a food frequency questionnaire (FFQ-Porto Alegre), covering 135 food items, in comparison with the average of two consecutive 24-hour dietary recall questionnaires for adolescents, adults, and elderly who were randomly selected from a population-based survey. The Pearson correlation coefficients and cross-classification by quartiles of intake were used. The nutrients were log transformed and energy adjusted. The mean of adjusted de-attenuated correlation coefficient for adolescents was 0.44 and ranged from 0.18 (zinc) to 0.69 (folate) and for adult and elderly participants they were, respectively, 0.42, ranging from 0.16 (iron) to 0.73 (energy) and 0.52, ranging from 0.25 (vitamin E) to 0.84 (energy). The average classification percentage into the same or adjacent quartile for the two methods was 74.6% for adolescents, 74.9% for adults, and 81.2% for the elderly population. The FFQ showed fair relative validity for adolescents and adults, and may be used to study the dietary determinants of obesity and non-transmissible diseases in epidemiological surveys.

scholarly journals Suicidal ideation during pregnancy: prevalence and associated factors among low-income women in São Paulo, Brazil

2012 ◽  
Vol 15 (2) ◽  
pp. 135-138 ◽  
Author(s):  
Hsiang Huang ◽  
Alexandre Faisal-Cury ◽  
Ya-Fen Chan ◽  
Karen Tabb ◽  
Wayne Katon ◽  
...  
Keyword(s):  
Suicidal Ideation ◽  
Low Income ◽  
Associated Factors ◽  
Sao Paulo ◽  
São Paulo ◽  
Low Income Women

scholarly journals Relative validity of a food frequency questionnaire among tin miners in China: 1992/93 and 1995/96 diet validation studies

1999 ◽  
Vol 2 (3) ◽  
pp. 301-315 ◽  
Author(s):  
MR Forman ◽  
J Zhang ◽  
L Nebeling ◽  
S-X Yao ◽  
MJ Slesinski ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Food Intake ◽  
Validation Study ◽  
Food Frequency Questionnaire ◽  
Validation Studies ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Average Frequency ◽  
Food Frequency ◽  
Food Recalls

AbstractObjectiveDiet validation research was conducted to compare the respondents' reporting of dietary intake in a food frequency questionnaire (FFQ) with intake reported in food recalls. Because the population received annual salary increments that could modify food intake, diet validation studies (DVSs) were conducted during two time intervals.DesignA 99-item FFQ was administered by an interviewer twice in a 1-year interval, and responses to each FFQ item were compared with 28 days of interviewer-administered food recalls that were collected in four 1-week intervals during each season of 1992/93. The second validation study in 1995/96 had a similar design to the earlier one.SettingA prospective cohort study of lung cancer among tin miners in China was initiated in 1992, with dietary and other risk factors updated annually.SubjectsAmong a cohort of high risk tin miners for lung cancer, two different samples (n = 141 in 1992/93, and n = 113 in 1995/96) for each diet validation study were randomly selected from four mine units, that were representative of all worker units.ResultsMiners reported a significantly higher average frequency of intake of foods in the food recalls than the FFQ, with few exceptions. Deattenuated Pearson correlation coefficients of the frequency of food intake between the FFQ and food recalls were in the range of –0.40 to 0.72 in both studies, with higher positive correlations for beverages and cereal staples than for animal protein sources, vegetables, fruits and legumes. The percentage of individuals with exact agreement in the extreme quartiles of intake in the food recalls and FFQ ranged from 0 to 100% in both studies.ConclusionsAmong Chinese miners, the range in correlations between the food recalls and the FFQ were due to: (i) market availability of foods during the food recall weeks compared to their annual reported intake in the FFQ; (ii) cultural perception of time; and (iii) differences in how the intake of mixed dishes and their multi-ingredient foods were reported in the recalls vs. the FFQ. The range in the percentage of agreement in the same quartiles and the changes in food intake over time may have implications for the analysis of the diet-disease relationship in this cohort.

scholarly journals Validation of a semi-quantitative food-frequency questionnaire for use among adults in Guatemala

2002 ◽  
Vol 5 (5) ◽  
pp. 691-698 ◽  
Author(s):  
Monica M Rodríguez ◽  
Humberto Méndez ◽  
Benjamín Torún ◽  
Dirk Schroeder ◽  
Aryeh D Stein
Keyword(s):  
Vitamin C ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Individual Variability ◽  
Food Frequency ◽  
Micronutrient Intake ◽  
Study Population ◽  
Cross Classification

AbstractObjective:The purpose of the study was to assess the validity of a 52-item semiquantitative food-frequency questionnaire (FFQ) by comparing it with multiple 24-hour dietary recalls.Design:Three non-consecutive 24-hour dietary recalls and one FFQ were administered over a one-month period.Setting:Four communities of El Progreso, Guatemala.Subjects:Seventy-three individuals aged 22–55 years.Results:Intakes of energy and other nutrients as measured by the FFQ were higher than intakes measured by 24-hour recalls. Energy was overestimated by 361 kcal, and nutrient overestimates were particularly great for vitamin C and iron. Pearson correlation coefficients for crude energy and nutrients intakes ranged from 0.64 for energy to 0.12 for vitamin C. Exact agreement for both methods (measured by the concordance correlation coefficient) ranged from 0.59 (fat) to 0.06 (vitamin C). Pearson correlation coefficients for energy-adjusted nutrients ranged from 0.59 (carbohydrates) to 0.11 (thiamin). Pearson correlation coefficients for the proportion of total energy derived from specific foods ranged from 0.59 (tortillas) to 0.01 (sugared beverages). Cross-classification of quartiles of crude nutrient intakes for both methods indicated that <11% were grossly misclassified; after adjusting for energy intake, <13% were grossly misclassified.Conclusions:This FFQ provides good measures of energy and macronutrient intakes and a reasonably reliable measure of micronutrient intake, indicating its suitability for comparing exposures within a study population in reference to heath-related endpoints. Our results highlight the need to adapt any FFQ to specific cultural needs – in this case, the Guatemalan ‘core foods’ (tortilla, bread and beans), for which inter-individual variability in intake is high.

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