Hi. For FFQ questionnaire, how to calculate the conversion factor [๐น๐‘Ÿ๐‘’๐‘ž๐‘ข๐‘’๐‘›๐‘๐‘ฆ ๐‘œ๐‘“ ๐‘“๐‘œ๐‘œ๐‘‘ ๐‘–๐‘ก๐‘’๐‘š๐‘  ๐‘–๐‘›๐‘ก๐‘Ž๐‘˜๐‘’/๐‘‘๐‘Ž๐‘ฆ] 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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