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.

State estimates for these years are no longer available due to methodological concerns with combining 2019 and 2020 data. We apologize for any inconvenience or confusion this may causeBecause 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 two years could be misleading.For more detail on this decision, see the 2019-2020state data page.

Guide to P-value tables

This report is a follow-up to the 2020 National Survey on Drug Use and Health (NSDUH)Sample Design Report. It further documents the 2020 NSDUH sample experiences by comparing expected outcomes with what actually occurred, and documenting unexpected issues that came up during the year. A summary of the sample design is included for context.Chapters:Introduces the report and summarizes the impact of the coronavirus 2019 (COVID-19) pandemic on sample design and data collection.Revisits the 2020 sample design.Documents the sample experiences at the third stage of sample selectionDocuments the sample experiences at the fourth stage of sample selectionDocuments the sample experiences at the fifth stage of sample selectionLooks at sampling error, through a computation of design effects and a comparison of observed and expected precisionExamines the Clinical Validation Study sample experience