scholarly journals Reproducibility and validity of a quantitative food-frequency questionnaire among Jamaicans of African origin

2001 ◽  
Vol 4 (5) ◽  
pp. 971-980 ◽  
Author(s):  
M Jackson ◽  
S Walker ◽  
J Cade ◽  
T Forrester ◽  
JK Cruickshank ◽  
...  
Keyword(s):  
Food Frequency Questionnaire ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Beta Carotene ◽  
Moderate Activity ◽  
Activity Levels ◽  
African Origin ◽  
Food Frequency ◽  
Cross Classification

AbstractBackground:An interviewer-administered quantitative food-frequency questionnaire (FFQ) was developed to determine the energy and nutrient intakes of adult Jamaicans of African origin as part of a study of the epidemiology of diabetes and hypertension.Methods:Reproducibility of the questionnaire was investigated in 123 participants aged 25–74 years. The relative validity of the FFQ was assessed against twelve 24-hour recalls administered over 12 months in 73 of the participants. In addition, energy intakes (EI) were compared with estimated basal metabolic rates (BMR).Results:Reproducibility correlation coefficients (Pearson and intraclass) varied between 0.42 for retinol and 0.71 for carbohydrate, with most values falling between 0.50 and 0.60. When compared with repeated 24-hour recalls, the FFQ estimated slightly higher energy (mean 6%) and macronutrient intakes (mean 2–14%), and was within 5% when expressed as a percentage of energy intake. Micronutrients were higher by 1.19 (calcium) to 1.61 times (vitamin C). Unadjusted correlations between the FFQ and the reference method ranged from 0.20 for beta-carotene to 0.86 for alcohol. Cross-classification of nutrients into quartiles showed that 46–48% of participants in the lowest and highest quartiles were jointly classified by both methods. Misclassifications were low for most nutrients with one or two persons misclassified at the extreme quartiles. EI/BMR ratios suggested light to moderate activity levels appropriate for an urban population in a developing country.Conclusions:The FFQ showed reasonable reproducibility and validity and is suitable for estimating the habitual intakes of energy and macronutrients, but was poor for some micronutrients (retinol and beta-carotene).

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.

scholarly journals Development and Validation of a Data-Based Food Frequency Questionnaire for Adults in Eastern Rural Area of Rwanda

2016 ◽  
Vol 9 ◽  
pp. NMI.S38374 ◽  
Author(s):  
Ayumi Yanagisawa ◽  
Noriko Sudo ◽  
Yukiko Amitani ◽  
Yuko Caballero ◽  
Makiko Sekiyama ◽  
...  
Keyword(s):  
Vitamin A ◽  
Rural Area ◽  
Food Frequency Questionnaire ◽  
Correlation Coefficients ◽  
Nutrient Intakes ◽  
Food Frequency ◽  
Food Records ◽  
Percent Contribution ◽  
Cross Classification ◽  
Development And Validation

This study aimed to develop and evaluate the validity of a food frequency questionnaire (FFQ) for rural Rwandans. Since our FFQ was developed to assess malnutrition, it measured energy, protein, vitamin A, and iron intakes only. We collected 260 weighed food records (WFRs) from a total of 162 Rwandans. Based on the WFR data, we developed a tentative FFQ and examined the food list by percent contribution to energy and nutrient intakes. To assess the validity, nutrient intakes estimated from the FFQ were compared with those calculated from three-day WFRs by correlation coefficient and cross-classification for 17 adults. Cumulative contributions of the 18-item FFQ to the total intakes of energy and nutrients reached nearly 100%. Crude and energy-adjusted correlation coefficients ranged from -0.09 (vitamin A) to 0.58 (protein) and from -0.19 (vitamin A) to 0.68 (iron), respectively. About 50%-60% of the participants were classified into the same tertile. Our FFQ provided acceptable validity for energy and iron intakes and could rank Rwandan adults in eastern rural area correctly according to their energy and iron intakes.

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 food-frequency questionnaire for estimating calcium intake in Belgian preschool children

2006 ◽  
Vol 95 (4) ◽  
pp. 802-816 ◽  
Author(s):  
Inge Huybrechts ◽  
Dirk De Bacquer ◽  
Christophe Matthys ◽  
Guy De Backer ◽  
Stefaan De Henauw
Keyword(s):  
Preschool Children ◽  
Food Frequency Questionnaire ◽  
Reference Method ◽  
Progressive Increase ◽  
Food Frequency ◽  
Diet Records ◽  
Good Ability ◽  
Significant Difference ◽  
Repeated Administrations ◽  
Cross Classification

Relative validity and reproducibility of a semi-quantitative food-frequency questionnaire (FFQ) for measuring preschool children's usual Ca intake were assessed using parents or guardians as a proxy. Estimated diet records (EDR; 3d) were used as the reference method and reproducibility was measured by repeated FFQ administrations 5 weeks apart. From 2095 preschool children (2·5–6·5 years) randomly selected in Flanders (Flemish region of Belgium), 1052 returned a FFQ and EDR. Stringent exclusion procedures reduced the sample for validity analyses to 509 children. From a separate sample of 244 preschool children, 124 returned two FFQ, of whom sixty were included in the reproducibility analysis. Mean Ca intakes were 838 (sd 305) and 777 (sd 296) mg/d for EDR and FFQ respectively, indicating a mean difference of 60·9 (sd 294·4) mg/d (p<0·001). Pearson's correlation was 0·52. Cross-classification analysis of the FFQ and EDR classified 83%of the subjects in the same or adjacent category and 2·4% in extreme quartiles. Actual values for surrogate FFQ quartiles showed a progressive increase in Ca intake (p<0·001). The FFQ correctly identified 77% of the children consuming less Ca than the age-specific RDA (800mg/d). Correlation between repeated administrations was 0·79. No significant difference between mean Ca intakes was established by two administrations (23·8 (sd 161·2) mg/d). Cross-classification of repeated administrations classified 93·4% of the subjects in the same or adjacent category and no subjects in extreme categories. This FFQ tended to underestimate preschool children's Ca intake when administered by a proxy. However, it demonstrated good repeatability and fairly good ability to classify subjects into extremes of Ca intake.

Agreement between a brief food frequency questionnaire and diet records using two statistical methods

2001 ◽  
Vol 4 (2) ◽  
pp. 255-264 ◽  
Author(s):  
GL Ambrosini ◽  
NH de Klerk ◽  
AW Musk ◽  
D Mackerras
Keyword(s):  
Food Frequency Questionnaire ◽  
Asbestos Exposure ◽  
Reliability And Validity ◽  
Correlation Coefficients ◽  
Beta Carotene ◽  
Cross Sectional Study ◽  
Limits Of Agreement ◽  
Cross Sectional ◽  
Food Frequency ◽  
Diet Records

AbstractObjectiveTo compare intra- and inter-method reliability of a semi-quantitative food frequency questionnaire (FFQ) designed specifically to measure beta carotene (BC) and retinol intake, using two methods – the limits of agreement (LOA) and the correlation coefficient.DesignA cross-sectional study of dietary intake.SettingA randomized trial of vitamin A supplements in 2769 subjects with past asbestos exposure.SubjectsData from 57 men and 26 women, aged 28–72 years, living in Western Australia.MethodsThe FFQ was administered at baseline (FFQ1) and repeated 1 year later (FFQ2). Four 1-week diet records (DRs) were completed during the year.ResultsMean agreement between FFQ2 and FFQ1 was 120% for BC and 98% for retinol. LOA were 47–306% and 21–459%, respectively. Mean agreement between FFQ2 and the DR was 149% for BC and 63% for retinol; LOA were 50–447% and 11–349%, respectively. Mean agreement and LOA varied across energy intakes. Between the DR and FFQ2, correlation coefficients were 0.36 for BC and 0.51 for retinol. These varied considerably across age, gender and energy intakes and were not in accordance with limits of agreement findings.ConclusionAlthough correlation coefficients were positive and significant, there was less than ideal intra-method and inter-method reliability shown by the limits of agreement method. Bias was uneven across the range of intakes, the LOA were wide and, compared with the DR, the FFQ significantly over-estimated BC and under-estimated retinol. This shows the limitations of calculating correlation coefficients alone, for assessing reliability and validity.

scholarly journals Improvement in dietary intake estimates through the combined use of different approaches

2019 ◽  
Vol 32 ◽  
Author(s):  
Raíssa do Vale Cardoso LOPES ◽  
Juliana Araújo TEIXEIRA ◽  
Dirce Maria MARCHIONI ◽  
Luisa Lina VILLA ◽  
Anna Regina GIULIANO ◽  
...  
Keyword(s):  
Dietary Intake ◽  
Food Frequency Questionnaire ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Weighted Kappa ◽  
Target Population ◽  
Dietary Intakes ◽  
Food Frequency ◽  
24 Hour Recall ◽  
Calibration Equations

ABSTRACT Objective This study aimed to compare dietary intake estimates using two different methodological approaches: use of new portions obtained with the 24-Hour Diet Recall, which was applied in the current study population, and the application of calibration equations, which were estimated using the same 24h-recalls. Methods Calibration equations were estimated using linear regression. The medians and confidence intervals of energy and nutrient intakes were assessed using all the approaches. The U Mann Whitney test was applied to verify differences among dietary intakes obtained with the 24 Hour Recall and Food Frequency Questionnaire-based methods. The correlation between different measures was assessed with Spearman coefficient. Weighted Kappa was used to verify the capability of the Food Frequency Questionnaire -based methods to classify individuals in the same intake levels of the 24 Hour Recall. Results Nine of the eleven components that were analyzed using the Food Frequency Questionnaire with standard portions and calibrated had medians significantly different from those obtained using the 24 Hour Recall; only the measurements of vitamin E and energy were statistically equal. For the Food Frequency Questionnaire with 24 Hour Recall portions, only the medians of vitamin D and B12 did not significantly differ from the 24 Hour Recall medians. Finally, for the Food Frequency Questionnaire with 24 Hour Recall portions and calibrated, all components, except folate and iron, had medians statistically equal to those obtained using the 24 Hour Recall. Spearman correlation coefficients were higher for the Food Frequency Questionnaire with 24 Hour Recall portions calibrated for all the assessed components, and the values ranged from 0.27 (total fat) to 0.57 (iron). Higher Kappa correlation coefficients were found for the Food Frequency Questionnaire 24 Hour Recall portions calibrated. Conclusion Calibrated FFQ with portions estimated from the own target population obtained better estimates of dietary intake, with values considerably more similar to those obtained with the reference method.

scholarly journals Development and Validation of a Food Frequency Questionnaire for Population of Adolescents in Croatia

2021 ◽  
Vol 59 (1) ◽  
Author(s):  
Ana Močić Pavić ◽  
Sara Sila ◽  
Tena Niseteo ◽  
Iva Hojsak ◽  
Sanja Kolaček
Keyword(s):  
Food Frequency Questionnaire ◽  
Rural Areas ◽  
Nutrient Intake ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Epidemiologic Studies ◽  
Nutritional Intake ◽  
Food Record ◽  
Anthropometric Parameters ◽  
Food Frequency

Research background. Food frequency questionnaire (FFQ) is an important method for estimation of dietary intake in epidemiologic studies. The aim of the study was to develop FFQ and evaluate its relative validity for adolescents aged 12 to 18 years old. Experimental approach. FFQ was developed from previously validated Youth/Adolescent diet questionnaire (YAQ) by modifying it in order to include Croatian national foods. The final version of the FFQ (FFQ-m) was composed of 87 food items. The reference method was a set of two 3 day food records (3D-FR) administered twice during the 3 non-consecutive days, one month apart. The FFQ-m was administered approximately on the last day of the second applied dietary food record. Adolescents were recruited from randomly selected elementary and high schools in urban and rural areas of Croatia. FFQ-m was validated on a sample of 84 adolescents (70.2 % female). Nutritional intake from FFQ-m was analysed by Microsoft Office Excel 2007 worksheet derived from the PRODI 5.7 software database, while nutritional intake from 3D-FR was estimated using PRODI 5.7 software. Spearman correlation coefficients (r) and Bland-Altman method were used to assess validity of FFQ-m compared to 3D-FR. Anthropometric parameters were assessed in 78 adolescents. Results and conclusions. The mean nutrient intakes estimated by FFQ-m were higher than those of the 3D-FR. The average correlation coefficients for energy and nutrients in our validation study was 0.40. On average, 76.5 % of adolescents were classified in the same or adjacent quartile of nutrient intake. Bland-Altman analysis showed good agreement with all macronutrients and some micronutrients (sodium, phosphorus, potassium, calcium, magnesium, iron). A simple self-administrated questionnaire completed by adolescents is a valid tool for measuring energy and nutrient intake among adolescent population. Novelty and scientific contribution. This is the first FFQ developed and validated for population of adolescents in Croatia.

scholarly journals Issues in assessing the validity of nutrient data obtained from a food-frequency questionnaire: folate and vitamin B12 examples

2004 ◽  
Vol 7 (6) ◽  
pp. 751-756 ◽  
Author(s):  
Victoria M Flood ◽  
Wayne T Smith ◽  
Karen L Webb ◽  
Paul Mitchell
Keyword(s):  
Food Frequency Questionnaire ◽  
Linear Trend ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Vitamin B ◽  
Cross Sectional ◽  
Validity Data ◽  
Food Frequency ◽  
Folate And Vitamin B12 ◽  
Nutrient Data

AbstractObjective:To compare methods used to assess the validity of nutrient intake data obtained from a food-frequency questionnaire (FFQ), using folate and vitamin B12 as nutrient examples.Design:Cross-sectional sample from a population cohort.Setting:Two postcode areas west of Sydney, Australia.Subjects:In total, 2895 people aged 49 years and older provided dietary data using a semi-quantitative FFQ (79% of 3654 subjects examined). The validity of the FFQ was assessed against three 4-day weighed food records (WFRs) completed by 78 people (mean age 70 years).Results:Folate and vitamin B12 validity data were assessed using different methods. The Spearman ranked correlations (energy-adjusted) were 0.66 for folate and 0.38 for vitamin B12. Using the Bland–Altman method, following loge transformation, no linear trend existed between the differences and means for folate and vitamin B12. Large differences existed between the FFQ and WFR in individual cases, particularly for vitamin B12. Finally, data were divided into quintile categories for the test and reference method: 79% classified folate within one quintile, 65% classified vitamin B12 within one quintile; there was no gross misclassification for folate and only 3% misclassification for vitamin B12.Conclusions:Different methods of analysis provided different information about the validity of the FFQ. Correlation coefficients should not be used alone to assess the validity of nutrient data, but should be used in conjunction with Bland–Altman analyses. Depending on the use of the data, additional assessment of classification categories is recommended. This worked example demonstrates that absolute intakes of folate and vitamin B12 should be used with caution.

scholarly journals Validation of a food frequency questionnaire designed for adolescents in Salvador, Bahia, Brazil

2016 ◽  
Vol 29 (2) ◽  
pp. 163-171 ◽  
Author(s):  
Jean Márcia Oliveira MASCARENHAS ◽  
Rita de Cássia Ribeiro SILVA ◽  
Maria Ester Pereira Conceição MACHADO ◽  
Carlos Antonio de Souza Teles SANTOS ◽  
Dirce Maria Lobo MARCHIONI ◽  
...  
Keyword(s):  
Public Schools ◽  
Food Frequency Questionnaire ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Kappa Statistics ◽  
Food Record ◽  
Food Frequency ◽  
Good Ability ◽  
The Mean

Objective: This study assessed the validity of a Food Frequency Questionnaire used to assess food intake in adolescents in Salvador, Bahia, Brazil. Methods: Seventy adolescents enrolled in public schools aged 11 to 17 years participated in this study. The dietary intake of the adolescents was assessed using the Food Frequency Questionnaire and the mean value of three-day food record, used as the reference method. The mean (and standard deviation) energy and nutrient intakes estimated from the Food Frequency Questionnaire and food records were calculated. The paired Student's t test was used to determine differences between the data. Results: Pearson's correlation coefficient and Kappa statistics were used to measure the strength of the association between the two instruments. There was variation in the crude unadjusted (r=0.61-0.73) and deattenuated (r=0.33-0.99) Pearson correlation coefficients. After adjusting for energy, the crude and deattenuated coefficients ranged from r=0.53-0.81 and r=0.27-0.99, respectively. The intake of energy and most nutrients were found to be adequate, except for fiber (r=0.27) and calcium (r=0.33), which showed a weak correlation. Kappa statistics showed good correlation between all values varying from r=0.47 to 0.73. Conclusion: It is considered that an average r value greater than 0.40 indicates a good correlation, the results obtained indicate the good ability of the Food Frequency Questionnaire to assess individuals according to their usual intake of most nutrients.

scholarly journals Reproducibility and Validity of a Food Frequency Questionnaire (FFQ) Developed for Middle-Aged and Older Adults in Semarang, Indonesia

Nutrients ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 4163
Author(s):  
Ahmad Syauqy ◽  
Diana Nur Afifah ◽  
Rachma Purwanti ◽  
Choirun Nissa ◽  
Deny Yudi Fitranti ◽  
...  
Keyword(s):  
Older Adults ◽  
Correlation Coefficient ◽  
Food Frequency Questionnaire ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Weighted Kappa ◽  
Nutritional Epidemiology ◽  
Kappa Statistics ◽  
Middle Aged ◽  
Food Frequency

We assessed the reproducibility and validity of a food frequency questionnaire (FFQ) among middle-aged and older adults in Semarang, Indonesia. A total of 259 subjects aged 40–80 years completed two FFQs (nine-month apart) and nine 24 h dietary recalls (24HDRs, as a reference method). The reproducibility of the FFQ was analyzed using correlation coefficient, intra-class correlation coefficient (ICC), weighted kappa statistics and misclassification analysis. The validity was estimated by comparing the data acquired from FFQ1 and 24HDRs. The crude Pearson’s correlation coefficients and ICC for total energy and nutrients between FFQ1 and FFQ2 ranged from 0.50 to 0.81 and 0.44 to 0.78, respectively. Energy adjustment decreased the correlation coefficients for most nutrients. The crude, energy-adjusted and de-attenuated correlation coefficients for FFQ1 and 24HDRs ranged from 0.41 to 0.70, 0.31 to 0.89 and 0.54 to 0.82, respectively. The agreement rates for the same or adjacent quartile classifications were 81.1–94.6% for two FFQs and 80.7–89.6% for FFQ1 and 24HDRs. The weighted kappa values were 0.21 to 0.42 for two FFQs and 0.20 to 0.34 for FFQ1 and 24HDRs. A positive mean difference was found in the Bland–Altman analyses for energy and macronutrients. The FFQ could be acceptable for nutritional epidemiology study among Indonesians.

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