(P11-019-24) Diet Intake and Dietary Supplement Data Collection: Preliminary Comparisons Between Pre-pandemic and Post-pandemic National Health and Nutrition Examination Survey
Ana L. Terry, MS, RD: No relevant financial relationship(s) with ineligible companies to disclose.
Objectives: To compare for the National Health and Nutrition Examination Survey across two time periods, pre-pandemic (2017-2018) and post-pandemic (August 2021-August 2023): 1) preliminary unweighted conditional response rates for two dietary interviews conducted on two separate days (day 1 Dietary Interview [d1 DI] and day 2 Dietary Interview [d2 DI]), each of which consist of a dietary 24-hour recall and dietary supplement (DS) use assessment; 2) interview times; and 3) the percentage of DS containers observed during the interview.
Methods: To reduce in-person time due to the COVID pandemic, changes were made in the August 2021-August 2023 data collection. Interview mode for the d1 DI changed from in-person at the mobile examination center (MEC) to a phone interview. DS 30-day use data collection was changed from being conducted during the in-person home interview to being conducted on the phone at the same time as the d1 DI. Additionally, two 24-hour DS assessments, which had previously been collected with the d1 and d2 DIs pre-pandemic were discontinued post-pandemic. Dietary telephone interviews occurred after the MEC exam.
Results: During the post-pandemic period, 76.8% of persons examined at the MEC completed the d1 DI and 66.7% completed the d2 DI, while 88.6% of those who were examined during the pre-pandemic period completed d1 DI and 76.1% completed the d2 DI. Mean interview times for d1 and d2 DIs were 28.2 minutes and 25 minutes, respectively, in the post-pandemic period, vs 22 minutes for d1 and 22.8 minutes for d2 pre-pandemic. Mean time to report 30-day DS use post-pandemic was 3.9 minutes vs 6.2 minutes in the pre-pandemic period. Post-pandemic, approximately 87% of DS containers were read by the participant over the phone vs. 85% of containers seen during the pre-pandemic home visit.
Conclusions: Shifting diet intake and 30-day DS use data collection to a phone interview was successful. Interview times and the reporting of DS information from containers were similar to that observed in the pre-pandemic survey. Attrition in reaching participants by phone after the MEC exam may have contributed to post-pandemic response rates.
Funding Sources: National Center for Health Statistics, Centers for Disease Control and Prevention, Department of Health and Human Services
