Methods

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The Center for Outcomes Research is a national leader in health services and statistical methodology research and applications.  Ongoing or recently completed projects undertaken by center investigators that focus on the development of new methods in outcomes research are listed below.

Ongoing Projects

AHRQ-CMS CHIPRA Pediatric Quality Measurement Center and Testing Laboratory

Funded by the Agency for Healthcare Research and Quality and the Centers for Medicare and Medicaid Services
Principal Investigator: Jeffrey H. Silber, MD, PhD

The AHRQ-CMS CHIPRA Laboratory at the Children’s Hospital of Philadelphia (CHOP) is one of seven Centers of Excellence (CoE) for the national Pediatric Quality Measures Program.  This program was established by the Children’s Health Insurance Program Reauthorization Act to foster the development of evidence-based pediatric quality measures, which have lagged significantly behind adult quality measures.  The CHOP CoE is currently focusing on studies related to continuity of insurance coverage, risk adjustment methodology in Medicaid and the Children’s Health Insurance Program, and patient reported outcomes. 

Improving Process Measurement

Funded by the Agency for Healthcare Research and Quality
Principal Investigator: Jeffrey H. Silber, MD, PhD

This project seeks to improve process measurement by (1) testing whether unadjusted process measures are biased because patient factors are associated with process adherence; and (2) developing a new methodology, “Multivariate Template Matching,” for more efficiently selecting patient charts in which to follow and compare process adherence.  If successful, results from this proposal could be utilized to implement template matching when assessing process compliance for Hospital Compare and other programs which study process as a quality of care indicator. 

Improving the Framework for Health Care Public Reporting

Funded by the Agency for Healthcare Research and Quality
Principal Investigator: Jeffrey H. Silber, MD, PhD

Any effort to improve the science of public reporting must include an approach that ensures that guidance provided to the public is accurate, informative, relevant and understandable. Through the use of Bayesian models (a form of statistical modeling that is ideally suited to compare risks), this project aims to develop a better method to present information to the public about hospital quality, a better model for predicting and comparing outcomes across hospitals, and better methods to select and improve future models that may be used to aid the public in hospital selection. 

Describing and Understanding Racial Disparities

Funded by the Agency for Healthcare Research and Quality
Principal Investigator:  Jeffrey H. Silber, MD, PhD

This project explores “Tapered Multivariate Matching,” a new theory and conceptual framework for examining racial disparities and quality of care. The aims of the study are to apply the tapered multivariate matching framework to breast and colorectal cancer using the national Medicare-SEER database to identify specific aspects of patient care that lead to quality differences by race and to demonstrate how tapered multivariate matching results can be conveyed in a clear and understandable report to policy analysts and the public.  

Recently Completed Projects

Obesity and Surgical Outcomes

Funded by the National Institute of Diabetes and Digestive and Kidney Diseases
Principal Investigator:  Jeffrey H. Silber, MD, PhD

Obesity has been implicated in predisposing patients to worse surgical outcomes (death and complications). However, the etiology of these outcome differences is not well understood or well defined. Developing approaches to improving outcomes in this population is therefore challenging.  The aim of this study was to examine, using an efficient design that incorporated a 3 state, 50-hospital Medicare augmented claims database and nested, detailed chart abstraction using a matched cohort design, the differences in outcomes and treatments between obese and normal weight patients who underwent general, orthopedic, vascular or urological surgery. 

Development of a Risk Adjusted Aggregated Complication Measure

Funded by the Pennsylvania Health Care Cost Containment Council
Principal Investigator:  Jeffrey H. Silber, MD, PhD

The study examined mortality, average lengths of hospitalization, length of stay outlier rates and ratings, readmission rates for any reason and for complication/infection and regionally adjusted average hospital charges. A method to aggregate across complications was developed in order to produce more stable measures of outcome.  

Investigating the Relationship Between Measures of Hospital Occupancy and Length of Stay

Funded by the Leonard Davis Institute of Health Economics at the University of Pennsylvania
Principal Investigator:  Scott A. Lorch, MD, MSCE

Using detailed data on neonatal patients treated at Kaiser Permanente hospitals, this project obtained unbiased measures of the relationship between occupancy and length of stay by including information on daily staffing and severity of illness at discharge not available in most administrative datasets and using various methods to account for simultaneity including time-varying models, instrumental variables, and proxy measures for length of stay. 

Improving Pediatric Severity Adjustment for Measuring Quality of Care

Funded by the Children's Hospital of Philadelphia
Principal Investigator:  Jeffrey H. Silber, MD, PhD

This project utilized the internal data generated by The Children's Hospital of Philadelphia and its satellite practices to develop a minimum, uniform pediatric research database.