Measuring nutritional knowledge using Item Response Theory and its validity in European adolescents

Objective To analyse the Nutritional Knowledge Test (NKT) using Item Response Theory (ITR) analysis and to assess the construct validity of the Nutritional Knowledge Scale (NKTS) and its associations with adolescent food group consumption and nutritional biomarkers. Design Cross-sectional study. Setting Multicentre investigation conducted in ten European cities. Participants Adolescents aged 12·5–17·5 years ( n 3215) who completed over 75 % of...