The object of this article was to systematically review available methods to measure
comorbidity and to assess their validity and reliability. A search was made in Medline and …

Administrative data result from administering health care delivery, enrolling members into
health insurance plans, and reimbursing for services. The primary producers of …

OBJECTIVE: To develop and validate a single numerical comorbidity score for predicting
short-and long-term mortality, by combining conditions in the Charlson and Elixhauser …

Objectives. This study attempts to develop a comprehensive set of comorbidity measures for
use with large administrative inpatient datasets. Methods. The study involved clinical and …

Background Although numerous studies suggest that there is an inverse relation between
hospital volume of surgical procedures and surgical mortality, the relative importance of …

Abstract Background The Charlson comorbidity index is often used to control for
confounding in research based on medical databases. There are few studies of the accuracy …

Background Although the relation between hospital volume and surgical mortality is well
established, for most procedures, the relative importance of the experience of the operating …

Background The prevalence, health care expenditures, and hospitalization experiences are
important considerations among elderly populations with multiple chronic conditions …

Abstract Objective To develop the Self‐Administered Comorbidity Questionnaire (SCQ) and
assess its psychometric properties, including the predictive validity of the instrument, as …

Objective: To determine whether the relationship between hospital volume and mortality has
changed over time. Background: It is generally accepted that hospital volume is associated …