Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Distribution of comorbidity indices. Each bar represents the percent of respondents with that index score, with separate bars for the Modified Charlson Comorbidity Index and the NSHAP Comorbidity Index. Error bars represent 95% confidence intervals.
