title: The reliability of an adolescent dietary pattern identified using reduced-rank regression: comparison of a FFQ and 3 d food record.
abstract: Despite the increasing use of dietary patterns (DP) to study diet and health outcomes, relatively few studies have examined the reliability of DP using different dietary assessment methods. Reduced-rank regression (RRR) is an emerging statistical method that incorporates a priori information to characterise DP related to specific outcomes of interest. The aim of the present study was to compare DP identified using the RRR method in a FFQ with those in a 3 d food record (FR). Participants were 783 adolescents from the Western Australian Pregnancy (Raine) Cohort Study who completed both a FFQ and FR at 14 years of age. A similar 'energy-dense, high-fat and low-fibre' DP was identified in the FFQ and FR that was characterised by high intakes of processed meat and sugar-sweetened beverages, and low intakes of vegetables and fresh fruit. Nutrient profiles for this DP were consistent in the FFQ and FR. Pearson's correlation coefficient between participants' z-scores for the DP identified in the FFQ and FR was 0·35 for girls and 0·49 for boys (P< 0·05). The mean difference between DP z-scores derived from the FFQ and FR was -0·08 (95 % CI -0·21, 0·04) for girls and -0·05 (95 % CI -0·17, 0·07) for boys. The 95 % limits of agreement were -2·55 to 2·39 for girls and -2·52 to 2·41 for boys. These findings suggest that very similar DP may be identified and their z-scores show modest agreement when applying the RRR method to dietary intake data collected from adolescents using a FFQ or FR.
authors.affiliation: MRC Human Nutrition Research,Cambridge,UK.
authors.forename: Geeta
authors.initials: G
authors.lastname: Appannah
authors.affiliation: MRC Human Nutrition Research,Cambridge,UK.
authors.forename: Gerda Karolien
authors.initials: GK
authors.lastname: Pot
authors.affiliation: School of Exercise and Health Science, Edith Cowan University,Joondalup,WA,Australia.
authors.forename: Therese Anne
authors.initials: TA
authors.lastname: O'Sullivan
authors.affiliation: Telethon Institute for Child Health Research, University of Western Australia,Perth,WA,Australia.
authors.forename: Wendy Hazel
authors.initials: WH
authors.lastname: Oddy
authors.affiliation: MRC Human Nutrition Research,Cambridge,UK.
authors.forename: Susan Ann
authors.initials: SA
authors.lastname: Jebb
authors.affiliation: MRC Human Nutrition Research,Cambridge,UK.
authors.forename: Gina Leslie
authors.initials: GL
authors.lastname: Ambrosini
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D015331:Cohort Studies; D004032:Diet / Q000009:adverse effects*; D015930:Diet Records; D059305:Diet, High-Fat / Q000009:adverse effects; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D015596:Nutrition Assessment; D009765:Obesity / Q000453:epidemiology / Q000209:etiology; D015203:Reproducibility of Results; D012306:Risk; D057566:Self Report; D012727:Sex Characteristics; D013223:Statistics as Topic; D014904:Western Australia / Q000453:epidemiology
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