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 …

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 …

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

Objectives: We studied the impact of noncardiac comorbidity on potentially preventable
hospitalizations and mortality in elderly patients with chronic heart failure (CHF) …

Background Although initiatives to regionalize cancer surgery are already under way, the
relative importance of volume in cancer surgery is disputed. Hypothesis We examined …

Objective. To define and improve the performance of existing comorbidity scores in
predicting mortality in Medicare enrollees. Data Sources. Study participants were two …

Objective Aimed at reducing surgical deaths, several recent initiatives have attempted to
establish volume-based referral strategies in high-risk surgery. Although payers are leading …

Objective To examine the relative impact of procedure volume versus years of hospital
experience on inpatient death rates after pancreaticoduodenectomy. Summary Background …

Objective Scoring systems that predict mortality do not necessarily predict prolonged length
of stay or costs in the intensive care unit (ICU). Knowledge of characteristics predicting …

Background: Previous studies have demonstrated that a high surgical volume for certain
surgical procedures reduces morbidity and improves economic outcome; however, to our …