Editors and researchers beware: calculating response rates in random digit dial health surveys.

OBJECTIVE: To demonstrate that different approaches to handling cases of unknown eligibility in random digit dial health surveys can contribute to significant differences in response rates. DATA SOURCE: Primary survey data of individuals with chronic disease. STUDY
DESIGN: We computed response rates using various approaches, each of which make different assumptions about the disposition of cases of unknown eligibility. DATA COLLECTION: Data were collected via telephone interviews as part of the Aligning Forces for Quality (AF4Q) consumer survey, a representative survey of adults with chronic illnesses in 17 communities and nationally. PRINCIPAL
FINDINGS: We found that various approaches to estimating eligibility rates can lead to substantially different response rates.
CONCLUSIONS: Health services researchers must consider strategies to standardize response rate reporting, enter into a dialog related to why response rate reporting is important, and begin to utilize alternate methods for demonstrating that survey data are valid and reliable. © Health Research and Educational Trust.