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Who is included in the National Survey on Drug Use and Health (NSDUH) estimates? How are they chosen?

NSDUH samples all people living in the United States who are:

  • Age 12 or older,
  • Not living in institutions such as prisons or nursing homes,
  • Not military personnel on active duty,

Due to the way the survey is conducted, they also must:

  • Have a fixed address, and
  • Be able to answer the questionnaire in either English or Spanish.

More information on data collection is available from the annual Data Collection Final Report.

NSDUH is conducted using stratified sampling with multiple levels of selection. Households are chosen geographically. That means that a particular area is randomly selected, and then households are selected within that area. Basic information is first collected from selected households, and then 0, 1, or 2 household members are chosen to complete the full survey. Respondents are chosen so that about a quarter are age 12 to 17, another quarter are age 18 to 25, 15 percent are age 26 to 34, 20 percent age 35 to 49, and 15 percent age 50 or older.

More detail on sampling procedures, including changes made over the past two decades, can be found in the annual NSDUH Sample Design Report.