NUTR 3070 Lecture Notes - Lecture 8: Observational Error, Questionnaire

• School: University of Guelph
• Department: Nutrition
• Course: NUTR 3070
• Professor: Angela Wallace

Document Summary

Food frequency questionnaires (ffq: purpose: to obtain frequency and, in some cases, portion size information about food and beverage consumption over a specified period of time, typically the past month or year. Description: a ffq consists of a list of foods and beverages with response categories to indicate usual frequency of consumption over the time period queried. Typically 80-120 items: usual portion size can be asked separately for ea(cid:272)h food a(cid:374)d (cid:271)e(cid:448)erage (cid:894)(cid:373)ost do(cid:374)"t(cid:895) Ffqs provide information on consumption of queried foods and beverages over the specified period: depending on whether portion size is determined, information may represent either usual frequency of consumption only or total amount usually consumed. Ffqs can be used to examine associations between diet and health or other variables. Ffqs are sometimes used to evaluate the effectiveness of interventions to change diet: not affected by reactivity, b(cid:272) they (cid:272)a(cid:374)"t really (cid:272)ha(cid:374)ge (cid:449)hat they"(cid:448)e do(cid:374)e i(cid:374) the past year.