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.
The solid lines were estimated by a parametric Weibull proportional hazards regression analysis for interval censored data, and the dotted lines were generated by an interval-censored Cox proportional hazard model. HR indicates hazard ratio.
