The HELENA online food frequency questionnaire: reproducibility and comparison with four 24-hour recalls in Belgian-Flemish adolescents

International audience ; Objectives To investigate the reproducibility of the HELENA food frequency questionnaire (FFQ), developed as a basis for an online tailored intervention and to compare the FFQ with four computerized 24-hour recalls. Subjects/methods A convenience sample of 48 Belgian-Flemish adolescents completed four computerized 24-hour recalls, the FFQ and a retest one to two weeks later. Correlations, the Wilcoxons Signed Rank test and Bland and Altmans plots were used to compare intakes of 22 food groups, energy (kcal), fibre (g, g/1000 kcal), vitamin C (mg, mg/1000 kcal), calcium... Mehr ...