Address correspondence to Katherine L. Kahn, M.D., Professor of Medicine, Associate Division Chief for Research, UCLA School of Medicine, Division of General Internal Medicine and Health Services Research, 911 Broxton Plaza, Los Angeles, CA 90095-1736. Dr. Kahn is also a Senior Scientist for RAND Health in Santa Monica, CA. Honghu Liu, Ph.D., is an Associate Adjunct Professor, UCLA School of Medicine, Division of General Internal Medicine and Health Services Research, Los Angeles. John L. Adams, Ph.D., is a Statistician at RAND Health, Santa Monica. Wen-Pin Chen, M.S., is a Programmer/Analyst, UCLA School of Medicine, Division of General Internal Medicine and Health Services Research, Santa Monica.
Methodological Challenges Associated with Patient Responses to Follow-up Longitudinal Surveys Regarding Quality of Care
Article first published online: 18 DEC 2003
Health Services Research
Volume 38, Issue 6p1, pages 1579–1598, December 2003
How to Cite
Kahn, K. L., Liu, H., Adams, J. L., Chen, W.-P., Tisnado, D. M., Carlisle, D. M., Hays, R. D., Mangione, C. M. and Damberg, C. L. (2003), Methodological Challenges Associated with Patient Responses to Follow-up Longitudinal Surveys Regarding Quality of Care. Health Services Research, 38: 1579–1598. doi: 10.1111/j.1475-6773.2003.00194.x
- Issue published online: 18 DEC 2003
- Article first published online: 18 DEC 2003
- Methodological challenges;
- longitudinal studies;
- quality of care
Objective. To illustrate, using empirical data, methodological challenges associated with patient responses to longitudinal surveys regarding the quality of process of care and health status, including overall response rate, differential response rate, and stability of responses with time.
Data Sources/Study Setting. Primary patient self-report data were collected from 30,308 patients in 1996 and 13,438 patients in 1998 as part of a two-year longitudinal study of quality of care and health status of patients receiving care delivered by 63 physician organizations (physician groups) across three West Coast states.
Study Design. We analyzed longitudinal, observational data collected by Pacific Business Group on Health (PBGH) from patients aged 18–70 using a four-page survey in 1996 and a similar survey in 1998 to assess health status, satisfaction, use of services, and self-reported process of care. A subset of patients with self-reported chronic disease in the 1996 study received an enriched survey in 1998 to more fully detail processes of care for patients with chronic disease.
Data Collection/Extraction Methods. We measured response rate overall and separately for patients with chronic disease. Logistic regression was used to assess the impact of 1996 predictors on response to the follow-up 1998 survey. We compared process of care scores without and with nonresponse weights. Additionally, we measured stability of patient responses over time using percent agreement and kappa statistics, and examined rates of gender inconsistencies reported across the 1996 and 1998 surveys.
Principal Findings. In 1998, response rates were 54 percent overall and 63 percent for patients with chronic disease. Patient demographics, health status, use of services, and satisfaction with care in 1996 were all significant predictors of response in 1998, highlighting the importance of analytic strategies (i.e., application of nonresponse weights) to minimize bias in estimates of care and outcomes associated with longitudinal quality of care and health outcome analyses. Process of care scores weighted for nonresponse differed from unweighted scores (p<.001). Stability of responses across time was moderate, but varied by survey item from fair to excellent.
Conclusions. Longitudinal analyses involving the collection of data from the same patients at two points in time provide opportunities for analysis of relationships between process and outcomes of care that cannot occur with cross-sectional data. We present empirical results documenting the scope of the problems and discuss options for responding to these challenges. With increasing emphasis in the United States on quality reporting and use of financial incentives for quality in the health care market, it is important to identify and address methodological challenges that potentially threaten the validity of quality-of-care assessments.