Hi. For FFQ questionnaire, how to calculate the conversion factor [๐น๐๐๐๐ข๐๐๐๐ฆ ๐๐ ๐๐๐๐ ๐๐ก๐๐๐ ๐๐๐ก๐๐๐/๐๐๐ฆ] 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.