25 Cities Where You Don’t Want to Get Sick

Methodology

To determine the cities where you don’t want to get sick, 24/7 Tempo created an index evaluating hospital quality using data for U.S. metropolitan statistical areas from the Centers for Medicare and Medicaid Services (CMS) and County Health Rankings, an annual analysis produced by the Robert Wood Johnson Foundation and University of Wisconsin Population Health Institute joint program. The index measures three sets of indicators: 30-day mortality rates after hospital admittance, 30-day readmission rates, and preventable hospitalizations. Mortality and readmission rates each make up 42.1% of the index, and the rate of preventable hospitalizations makes up the remaining 15.8%.

The CMS produces statistics on numerous health measures for more than 4,000 Medicare-certified hospitals in the country. We grouped hospitals by metropolitan areas and aggregated the hospital data to the metropolitan statistical area level.

Mortality rates

We calculated a weighted average of 30-day mortality rates for heart attacks, chronic obstructive pulmonary disease (COPD), coronary artery bypass grafting (CABG), heart failure, pneumonia, and stroke patients to find the average percentage of people who died within 30 days of being admitted to a hospital. The CMS adjusted the mortality measures for differences in risk variables such as age, comorbidities — the presence of multiple ailments for a given patient — and patient frailty. CMS estimates the data for 30-day mortality by each condition per hospital from Medicare patients.

Readmission rates

The readmission rate measure estimates unplanned readmission to an acute care hospital within 30 days of being discharged from a hospital for Medicare beneficiaries 65 or older. Patients may have an unplanned readmission for any reason.

Preventable hospitalization

Preventable hospitalization is a measure of  the share of hospitalizations for conditions that could have been treated at outpatient or ambulatory care facilities — often referred to as the preventable hospitalization rate. This measure counts hospitalizations for conditions such as asthma, dehydration, or hypertension per 1,000 Medicare enrollees. This data is from the 2019 CHR report.

Income figures are one-year estimates from the U.S. Census Bureau’s 2019  American Community Survey. Population figures are from the Census Bureau’s Population Projections program and are estimates for July 2019. Data on the share of residents living in urban and rural areas comes from the Census Bureau’s 2010 decennial census.

Measures of individual health behaviors and outcomes, including obesity, smoking rates, and sedentary lifestyles, also come from CHR.