How accurate are adolescents in portion-size estimation using the computer tool young adolescents' nutrition assessment on computer (YANA-C)?

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Vereecken, Carine ; Dohogne, Sophie ; Covents, Marc ; Maes, Lea (2010)
  • Journal: (issn: 0007-1145)
  • Related identifiers: doi: 10.1017/S0007114510000127
  • Subject: BLACK-ADOLESCENTS | PHOTOGRAPHS | CHILDREN | CRITERION VALIDITY | DIETARY | REPRODUCIBILITY | ATLAS | FOOD FREQUENCY QUESTIONNAIRE | IRON | CONSUMPTION | Medicine and Health Sciences
    mesheuropmc: food and beverages

Computer-administered questionnaires have received increased attention for large-scale population research on nutrition. In Belgium-Flanders, Young Adolescents' Nutrition Assessment on Computer (YANA-C) has been developed. In this tool, standardised photographs are available to assist in portion-size estimation. The purpose of the present study is to assess how accurate adolescents are in estimating portion sizes of food using YANA-C. A convenience sample, aged 11-17 years, estimated the amounts of ten commonly consumed foods (breakfast cereals, French fries, pasta, rice, apple sauce, carrots and peas, crisps, creamy veloute, red cabbage, and peas). Two procedures were followed: (1) short-term recall: adolescents (n 73) self-served their usual portions of the ten foods and estimated the amounts later the same day; (2) real-time perception: adolescents (n 128) estimated two sets (different portions) of pre-weighed portions displayed near the computer. Self-served portions were, on average, 8 % underestimated; significant underestimates were found for breakfast cereals. French fries, peas, and carrots and peas. Spearman's correlations between the self-served and estimated weights varied between 0.51 and 0.84, with an average of 0.72. The kappa statistics were moderate (> 0.4) for all but one item. Pre-weighed portions were, on average, 15% underestimated, with significant underestimates for fourteen of the twenty portions. Photographs of food items can serve as a good aid in ranking subjects; however, to assess the actual intake at a group level, underestimation must be considered.
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