Hi. For FFQ questionnaire, how to calculate the conversion factor [πΉππππ’ππππ¦ ππ ππππ ππ‘πππ πππ‘πππ/πππ¦] 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.