Appendix B, Eighth Graphic Equation: Results from the 2004 National Survey on Drug Use and Health: National Findings

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

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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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