Jyh Eiin Wong|Winsome Parnell|Katherine Black|Paula Skidmore
Reliability and relative validity of a food frequency questionnaire to assess food group intakes in New Zealand adolescents
University of Otago|University of Otago|University of Otago|University of Otago
abstract background due absence current validated food frequency questionnaire ffq use new zealand adolescents need develop one costeffective way assess adolescents food patterns study aims examine testretest reliability relative validity new zealand adolescent ffq nzaffq assess food group intake adolescents aged 14 18 years methods nonquantitative without portion size 72item ffq developed pretested fiftytwo participants aged 149 08 years completed nzaffq twice within twoweek period testretest reliability fortyone participants aged 151 09 years completed fourday estimated food record 4dfr addition ffqs enable assessment validity spearmans correlations crossclassification analyses used examine relative validity intraclass correlations additionally used testretest reliability results weekly intakes estimated food item aggregated 34 food groups median spearmans correlation coefficient scc ffq administrations 071 sccs ranged 046 fruit juice cordial 087 nonstandard milk median intraclass correlation coefficient icc ffq administrations 069 median scc food groups ffq 4dfr 040 highest scc seen standard milk 070 exact agreement methods ranking participants thirds highest meat alternatives 78 lowest red yellow vegetables potatoes 27 mean percent participants misclassified extreme thirds food group intake 12 conclusions despite small sample size nzaffq exhibited good excellent shortterm testretest reliability reasonable validity ranking majority food group intakes among adolescents aged 14 18 years comparability validity current literature suggests nzaffq may used among adolescent new zealanders identify dietary patterns rank according food group intake