175 years have elapsed since John Hutchinson introduced the world to his version of an
apparatus that had been in development for nearly two centuries, the spirometer. Though he …

Background This study examined the incidence of a person's first diagnosis of a selected
chronic disease, and the relationships between modifiable lifestyle risk factors and age to …

Background Multimorbidity, the co-occurrence of two or more chronic conditions, is common
among older adults and is known to be associated with high costs and gaps in quality of …

Rationale: Current evidence on the relationship between long-term exposure to air pollution
and new onset of chronic lung disease is inconclusive. Objectives: To examine associations …

An explosion of new data sources has increased focus on the use of “real-world” information
to inform patient-centered care. Enthusiasm for such a “learning health care system” is …

Background: People with a recent history of homelessness are believed to be at high risk of
infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and, when …

Introduction: To determine if using a combination of hospital administrative data and
ambulatory care physician billings can accurately identify patients with congestive heart …

Importance Single-center studies identify frailty as a risk factor for 30-day postoperative
mortality. The long-term and population-level effect of frailty on postoperative mortality is, to …

Importance Controversy exists about the preferred surgical approach for total hip
arthroplasty (THA). Objective To determine whether an anterior approach is associated with …

Abstract Editor's Perspective What We Already Know about This Topic Days alive and out of
hospital is an easily obtained patient-centered outcome What This Article Tells Us That Is …