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Official websites use .gov
A .gov website belongs to an official government organization in the United States.

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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.

Numerator exclusion

A numerator exclusion defines an instance measured entities should not include in the numerator data. Use numerator exclusions only in ratio and proportion measures.