Development and validation of the semi‐quantitative brief food frequency questionnaire to assess the magnesium intake in young women

Aim The aim of the study was to develop and validate the semi‐quantitative brief food frequency questionnaire to assess the magnesium intake (Mg‐FFQ). Methods The developed questionnaire consists of 39 questions and it was validated in a group of 75 women aged 20‐30. The validity was assessed with reference to the 3‐day dietary record and the reproducibility was assessed for a period of 6 weeks. Results The Bland‐Altman index for the assessment...