Figure 1.
Receiver operating characteristic (ROC) curve for age (< 50.5 years) and duration of chief complaint (< 4.5 days) as factors predictive of failure of medical treatment. CI, confidence interval.
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.