Comparison of Mail and Telephone in Assessing Patient Experiences in Receiving Care from Medical Group Practices

Abstract

The medical group survey from the CAHPS® (formerly Consumer Assessment of Health Plans Study) project, G-CAHPS, focuses on patient experiences in receiving care from their medical group practice. We compared mail and telephone responses to the GCAHPS survey in a sample of 880 patients fromfour physician groups. Patients were randomly assigned to mode. Analyses included comparison of response rates, missing data, internal consistency reliability of six multiitem scales, and mean scores. A total of 537 phone completes and 343 mail completes were obtained (54% response rate). There were no significant differences in internal consistency by mode. In addition, there was only one significant mode difference in item and composite means by mode of administration after adjusting for case-mix differences. This study indicates that mail and telephone modes of data collection for the G-CAHPS survey produce similar results.