Getting Physicians to Respond: The Impact of Incentive Type and Timing on Physician Survey Response Rates

Abstract

OBJECTIVE: To study the effects of payment timing, form of payment, and requiring a social security number (SSN) on survey response rates. DATA SOURCE: Third-wave mailing of a U.S. physician survey. STUDY DESIGN: Nonrespondents were randomized to receive immediate U.S.$25 cash, immediate U.S.$25 check, promised U.S.$25 check, or promised U.S.$25 check requiring an SSN. DATA COLLECTION METHODS: Paper survey responses were double entered into statistical software. PRINCIPAL FINDINGS: Response rates differed significantly between remuneration groups (χ(3) (2) = 80.1, p<.0001), with the highest rate in the immediate cash group (34 percent), then immediate check (20 percent), promised check (10 percent), and promised check with SSN (8 percent). CONCLUSIONS: Immediate monetary incentives yield higher response rates than promised in this population of nonresponding physicians. Promised incentives yield similarly low response rates regardless of whether an SSN is requested.