Recruiting worksites to participate in a health promotion research study

PURPOSE: In this study, the type and size of participating and nonparticipating worksites in a health promotion research trial were examined. DESIGN: In-person and telephone contacts were made with representatives from a random sample of eligible worksites recruited to participate in a research trial to increase fruit and vegetable consumption. SETTING: Worksites that had 250 to 2000 employees and a worksite cafeteria were recruited. SUBJECTS: Eighty-one worksites were contacted. MEASURES: A census of eligible worksites (N = 109) formed the recruitment base, and a random selection of worksites (N = 81) was personally contacted and asked to participate in the research. Information on size, type of worksite, and a worksite representative was obtained from a privately compiled list covering the greater Puget Sound area. Eligibility for the project included the presence of an onsite cafeteria at the worksite as assessed by a brief telephone call. RESULTS: Thirty-six of the contacted worksites (44.5%) agreed to participate. There were no significant differences in participation by type or size of worksite. DISCUSSION: Worksites can be recruited to participate in research trials. No particular type or size of worksite is more likely to participate. Instituting pre-randomization participation conditions may reduce post-randomization dropout by ascertaining compliance with research requirements before randomization.