Capital L sub t comma a comma i equals the time period during which the target period (t) was occurring intersected with the period in which person i was at least a sub 1 years old, but not yet a sub 2 years old, and also intersected with the period since person i entered the United States, if person i is an immigrant.

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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.