Maria Jackson|Susan Walker|Janet Cade|Terrence Forrester|J K Cruickshank|Rainford Wilks
Reproducibility and validity of a quantitative food-frequency questionnaire among Jamaicans of African origin
University of the West Indies System|University of the West Indies System|Nuffield Health|University of Leeds|University of the West Indies System|University of Manchester|University of the West Indies System
intervieweradministered quantitative foodfrequency questionnaire ffq developed determine energy nutrient intakes adult jamaicans african origin part study epidemiology diabetes hypertensionreproducibility questionnaire investigated 123 participants aged 2574 years relative validity ffq assessed twelve 24hour recalls administered 12 months 73 participants addition energy intakes ei compared estimated basal metabolic rates bmrreproducibility correlation coefficients pearson intraclass varied 042 retinol 071 carbohydrate values falling 050 060 compared repeated 24hour recalls ffq estimated slightly higher energy mean 6 macronutrient intakes mean 214 within 5 expressed percentage energy intake micronutrients higher 119 calcium 161 times vitamin c unadjusted correlations ffq reference method ranged 020 betacarotene 086 alcohol crossclassification nutrients quartiles showed 4648 participants lowest highest quartiles jointly classified methods misclassifications low nutrients one two persons misclassified extreme quartiles eibmr ratios suggested light moderate activity levels appropriate urban population developing countrythe ffq showed reasonable reproducibility validity suitable estimating habitual intakes energy macronutrients poor micronutrients retinol betacarotene