Hi. For FFQ questionnaire, how to calculate the conversion factor [πΉπ‘Ÿπ‘’π‘žπ‘’π‘’π‘›π‘π‘¦ π‘œπ‘“ π‘“π‘œπ‘œπ‘‘ π‘–π‘‘π‘’π‘šπ‘  π‘–π‘›π‘‘π‘Žπ‘˜π‘’/π‘‘π‘Žπ‘¦] if the option has range? If once a week, the conversion factor will be 1/7=0.14. How about range ie; 2 to 3 times per week? Thanks.

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