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.
Calibration plot of preconception comorbidity index in predicting SMM excluding transfusion-only cases. Assessed using validation set of births, n = 23,525. Density plot below calibration curve shows distribution of the sample across predicted risks.
