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SUPPLEMENTARY
TABLE 1. Mean, within- and between- coefficient of variation (CV %) of energy-adjusted daily nutrient intakes for three-24 hour diet recalls collected in 1993, among 80 participants Daily Nutrient IntakeOverall
MeanCV%
(n=80)Days needed to lie within 20% of true mean Within*Between*Ratio Total calories (kcal)218026270.966Total fat (gm)5324211.155Saturated fat (gm)1931181.739Monounsaturated fat (gm)1926201.316Polyunsaturated fat (gm)1135181.9312Cholesterol (gm)15752192.6626Total protein (gm) 612482.875Carbohydrates (gm)2221681.943Dietary fiber (gm) 1131142.239Total Vitamin A (IU) 513277213.6758Retinol (IU) 203483611.3667Beta-carotene (IU) 2989103102Vitamin C (mg) 13190601.5178Riboflavin,Vitamin B2 (mg)223161.405Pyroxidine,Vitamin B6 (mg)229142.028Vitamin B12 (mcg) 444172.5018Folate (mcg)28755321.7129Calcium (mg)85441301.3916Iron (mg)1333231.4611Caffeine (mg)57129911.42161*The within and between-person CV% values were estimated on the original scale by square rooting the within- and between-person variances of the log-transformed nutrients and multiplying by 100. ADDIN EN.CITE Chinn1990757517Chinn, S.The assessment of methods of measurementStat MedStat Med351-6291990Rosner200074746Rosner, B.Fundamentals of biostatistics7922000Pacific Grove (CA)Duxbury Press" 24,25 To account for zero nutrient values, the constant one was added to each nutrient value before the data was log-transformed. The variances were obtained using ANOVA. Ratio= within-person CV% / between-person CV%n= (1.96 x CV within/ Do) 2 where n= number of days, Do=the specified limit, as a percentage of long-term true intake, here, 20%. ADDIN EN.CITE Beaton19797717Beaton, G. H.Milner, J.Corey, P.McGuire, V.Cousins, M.Stewart, E.de Ramos, M.Hewitt, D.Grambsch, P. V.Kassim, N.Little, J. A.Sources of variance in 24-hour dietary recall data: implications for nutrition study design and interpretationAm J Clin NutrAm J Clin Nutr2546-93212AdultCholesterol, Dietary*Diet SurveysDietary CarbohydratesDietary FatsDietary ProteinsEnergy IntakeFemaleFood AnalysisHumanInterviews/methodsMaleMental Recall*Nutrition*Nutrition SurveysResearch DesignSex FactorsStatisticsSupport, U.S. Gov't, P.H.S.1979Dec506977http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=506977" 12Between-person variance not estimatable
Supplementary References
24. Chinn S. The assessment of methods of measurement. Stat Med. 1990:9:351-362
25. Rosner B. Fundamentals of Biostatistics. Pacific Grove (CA): Duxbury Press; 2000.
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