Influence of recording length on reporting status

Anja Pia Biltoft-Jensen, Jeppe Matthiessen, Sisse Fagt, Margit Velsing Groth, Lone Banke Rasmussen, Ole Hels

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Abstract

Background: Use of short recording periods is often applied in prospective dietary surveys in order to reduce participant burden, fatigue, drop-out or misreporting. It is also assumed that a shorter recording period may help optimize initial participation because of the lower burden. Objective: To investigate the impact of recording length on reporting status, expressed as the ratio between energy intake and calculated basal metabolic rate (EI/BMR), the percentage of consumers of selected food items and the number reported food items per meal and eating occasions per day. Methods: Data from two different population samples were used for comparison. In total 138 adult volunteers (68 men and 70 women aged 20-59 years) recruited within the Copenhagen area and 2504 (1153 men and 1351 women aged 20-59 y) randomly selected adults from the Danish Civil Registration System, whom participated in a validation study and the Danish National Survey of Dietary Habits and Physical Activity 2000-2002, respectively. Both studies had a cross-sectional design. Volunteers and participants completed a pre-coded food diary every day for 7 consecutive days. BMR was predicted from equations. Results: In the validation study, EI/BMR was significantly lower on 1st, 2nd and 3rd consecutive recording days compared to 4-7 recording days (P <0.032). The same results were seen in the Danish National Survey except that only day 1-2 was lower than day 3-7 (P <0.006). The proportion of consumers of selected food items increased with the number of recording days and was minimum 10 % higher for 7 days compared to 4 days. The number of eating occasions per day and the number of reported food items per meal did not differ between 4 and 7 recording days. Conclusion: Reducing the recording period from 7 to 4 consecutive days did not change EI/BMR at group level. Still a study effect seemed to occur in the two population samples resulting in lower estimates of EI/BMR day 1-2. The proportion of consumers was higher with a 7-day recording. These results support a reporting period from 4-7 days.
Original languageEnglish
Title of host publication7th International Conference on Diet and Activity Methods : Diet and Physical Activity Assessment: From the Individual to the Environment
Number of pages370
PublisherU.S. National Cancer Institute
Publication date2009
Publication statusPublished - 2009
Event7th International Conference on Diet and Activity Methods: Diet and Physical Acitvity Assessment: From the Individual to the Environment - Washington DC, United States
Duration: 4 Jun 20097 Jun 2009
Conference number: 7

Conference

Conference7th International Conference on Diet and Activity Methods
Number7
Country/TerritoryUnited States
CityWashington DC
Period04/06/200907/06/2009

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