Content of this section

• Why does SAMHSA caution against comparing 2021 estimates with estimates from prior years?
• Why does SAMHSA caution against comparing 2020 estimates with estimates from other years?
• When did NSDUH make the change from DSM-IV to DSM-5 for assessing mental health and substance use disorder?
• Why does SAMHSA caution against comparing many 2015 estimates with estimates from prior years?
• Are definitions for pain reliever use prior to 2015 comparable to later definitions?
• How far back can I compare recent estimates for Any Mental Illness (AMI) and Serious Mental Illness (SMI)?
• In 2020, why did the number of people with a substance use disorder (SUD) double?
• When substate regional estimates are produced, are the regions the same each time?
• Why can’t 2020 or 2021 data be pooled with data from other years? What about 2015 data?
• Is the NSDUH data from 2022 comparable with data from 2021?