2018-2020 NSDUH Substate Region Definitions

Substate estimates for these years are no longer available due to methodological concerns with combining 2020 data with data from 2018 and 2019. We apologize for any inconvenience or confusion this may cause.Because of the COVID-19 pandemic, most respondents answered the survey via the web in Quarter 4 of 2020, even though all responses in Quarter 1 were from in-person interviews. It is known that people may respond to the survey differently while taking it online, thus introducing what is called a mode effect.When the state estimates were released, it was assumed that the mode effect was similar for different groups of people. However, later analyses have shown that this assumption should not be made. Because of these analyses, along with concerns about the rapid societal changes in 2020, it was determined that averages across the three years could be misleading.For more detail on this decision, see the 2018-2020substate data page.

Data and Resources

Field Value
accessLevel public
bureauCode {009:30}
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catalog_@id https://healthdata.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier https://healthdata.gov/api/views/f2ka-6w8m
issued 2025-07-14
landingPage https://healthdata.gov/d/f2ka-6w8m
modified 2025-09-06
programCode {009:061}
publisher Substance Abuse and Mental Health Services Administration
resource-type Dataset
source_datajson_identifier true
source_hash 6bbd780290e8a234b7c5a7f08a70e544bc2a800b4293554770e9e66a0ebe50c9
source_schema_version 1.1
theme {SAMHSA}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • data-quality
  • mental-health
  • samhsa
  • substance-use
  • survey-methodology
isopen False
license_id notspecified
license_title License not specified
maintainer SAMHSA
maintainer_email SAMHSAInfo@samhsa.hhs.gov
metadata_created 2025-09-23T16:47:10.981667
metadata_modified 2025-09-23T16:47:10.981674
notes Substate estimates for these years are no longer available due to methodological concerns with combining 2020 data with data from 2018 and 2019. We apologize for any inconvenience or confusion this may cause.Because of the COVID-19 pandemic, most respondents answered the survey via the web in Quarter 4 of 2020, even though all responses in Quarter 1 were from in-person interviews. It is known that people may respond to the survey differently while taking it online, thus introducing what is called a mode effect.When the state estimates were released, it was assumed that the mode effect was similar for different groups of people. However, later analyses have shown that this assumption should not be made. Because of these analyses, along with concerns about the rapid societal changes in 2020, it was determined that averages across the three years could be misleading.For more detail on this decision, see the 2018-2020substate data page.
num_resources 1
num_tags 13
title 2018-2020 NSDUH Substate Region Definitions