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.
Hospital variance estimates from multilevel logistic models of infant survival. Dashed horizontal line: intercept-only model; circle: models with 1 infant-level covariate; triangle: models with 1 hospital-level covariate of mean or proportion
