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Contemp Clin Trials Commun. 2017 Jun;6:140-146. doi: 10.1016/j.conctc.2017.04.002. Epub 2017 Apr 10.

Comparison of recruitment and retention among demographic subgroups in a large diverse population study of diet.

Author information

1
Henry Ford Health System, Department of Public Health Sciences, 1 Ford Place, Detroit, MI 48202, USA.
2
Health Studies Section, Westat, 1600 Research Boulevard, Rockville, MD, USA.
3
Kaiser-Permanente, Division of Research, 2000 Broadway, Oakland, CA, USA.
4
Marshfield Clinic Research Foundation, Epidemiology Research Center, 1000 North Oak Avenue, Marshfield, WI, USA.
5
National Cancer Institute, Division of Cancer Control and Population Sciences, 9609 Medical Center Drive, Rockville, MD, USA.

Abstract

OBJECTIVE:

We examined the feasibility of conducting a longitudinal study of diet among diverse populations by comparing rates of response throughout recruitment and retention phases by demographic and other characteristics.

METHODS:

Using quota sampling, participants were recruited from 3 geographically and demographically diverse integrated health systems in the United States. Overall, 12,860 adults, ages 20-70, were invited to participate via mail. Participation first required accessing the study's website and later meeting eligibility criteria via telephone interview. Enrollees were asked to provide two 24-hour dietary recalls, either interviewer-administered or self-administered on the web, over 6 weeks. Stepped monetary incentives were provided.

RESULTS:

Rates for accessing the study website ranged from 6% to 23% (9% overall) across sites. Site differences may reflect differences in recruitment strategy or target samples. Of those accessing the website, enrollment was high (≥ 87%). Of the 1185 enrollees, 42% were non-Hispanic white, 34% were non-Hispanic black, and 24% were Hispanic. Men and minorities had lower enrollment rates than women and non-Hispanic whites, partially due to less successful telephone contact for eligibility screening. Once enrolled, 90% provided 1 recall and 80% provided both. Women had higher retention rates than men, as did older compared to younger participants. Retention rates were similar across race/ethnicity groups.

CONCLUSIONS:

While study recruitment remains challenging, once recruited most participants, regardless of race/ethnicity, completed two 24-hour dietary recalls, both interviewer-administered and self-administered on the web. This study demonstrates the feasibility of collecting multiple 24-hour recalls including less expensive automated self-administered recalls among diverse populations.

KEYWORDS:

automated nutritional assessment; diet survey; experimental design; population; recruitment; retention

Conflict of interest statement

Conflicts of interest: No conflict of interest was declared by the authors of this paper.

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