Figure 4. Risk differences and 95% confidence intervals for phototherapy controlling for hospital only or all known confounders (full model). Instrumental variables were based on hospital of birth only; see text.
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.