Validation and reproducibility of an FFQ for use among adults in Botswana.

Objective: To evaluate the validity and reproducibility of a 122-item interviewer administered quantitative FFQ developed to determine food and nutrient intakes of adults in Botswana.

Design: Relative validity of the FFQ was evaluated by comparing nutrient and food group intakes against four non-consecutive 24 h recalls administered over 12 months. The FFQ was repeated after 1 year to assess reproducibility.