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Nutrition and drinking habits were assessed by using a semiquantitative food frequency questionnaire. The exposure to arsenic was calculated by weighting the frequency categories of food intake as follows

times/week   weight

< 1                  0

1                    1

1-3                 2

4-7                  3 

For each food item, the content of arsenic per kg was taken from the final report of the EC-funded project PHARE, together with the average annual consumption (kg).

Asres2 considers additionally self-suppliers with vegetables and fruits as highly exposed to environmental arsenic.

How reliable are food frequency data?