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The incidence rate is equal to the number of new cases divided by the person time of exposure.

Back to Appendix B, Eighth Graphic Equation
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This page was last updated on May 20, 2008.

SAMHSA, an agency in the Department of Health and Human Services, is the Federal Government's lead agency for improving the quality and availability of substance abuse prevention, addiction treatment, and mental health services in the United States.

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