Optimized Probability Sampling of Study Sites to Improve Generalizability in a Multisite Intervention Trial
Published Date:Dec 15 2009
Source:Prev Chronic Dis. 7(1).
Pubmed Central ID:PMC2811505
Funding:5R18DP001144-02/DP/NCCDPHP CDC HHS/United States
5T32 PE14001-20/PE/BHP HRSA HHS/United States
U48/DP000059/DP/NCCDPHP CDC HHS/United States
Studies of type 2 translation, the adaption of evidence-based interventions to real-world settings, should include representative study sites and staff to improve external validity. Sites for such studies are, however, often selected by convenience sampling, which limits generalizability. We used an optimized probability sampling protocol to select an unbiased, representative sample of study sites to prepare for a randomized trial of a weight loss intervention.
We invited North Carolina health departments within 200 miles of the research center to participate (N = 81). Of the 43 health departments that were eligible, 30 were interested in participating. To select a representative and feasible sample of 6 health departments that met inclusion criteria, we generated all combinations of 6 from the 30 health departments that were eligible and interested. From the subset of combinations that met inclusion criteria, we selected 1 at random.
Of 593,775 possible combinations of 6 counties, 15,177 (3%) met inclusion criteria. Sites in the selected subset were similar to all eligible sites in terms of health department characteristics and county demographics.
Optimized probability sampling improved generalizability by ensuring an unbiased and representative sample of study sites.
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