Major Depression — Statistics

Used in 2 entries

For each citing entry, the verbatim excerpt and Likelier's calculation notes (how the source's number was converted to the lifetime-probability framing) are shown below. Click through to read the full claim ledger.

1. [1] Major depression Risk

   Statistic

   An estimated 21.0 million US adults (8.3%) had at least one major depressive episode in the past year (2021); highest among 18-25 year olds (18.6%); females (10.3%) vs males (6.2%)

   “"An estimated 21.0 million adults in the United States had at least one major depressive episode. This number represented 8.3% of all U.S. adults... The prevalence of major depressive episode was higher among adult females (10.3%) compared to males (6.2%)."”

   Calculation notes

   NIMH republishes SAMHSA NSDUH data. The 8.3% past-year prevalence is consistent with the NESARC-III 12-month prevalence of 10.4% (NSDUH uses a screening instrument rather than a full diagnostic interview, which tends to yield slightly different estimates). The 21 million figure is the annual incidence/recurrence count; lifetime accumulation of this annual flow is what produces the 20.6% lifetime prevalence in the NESARC-III cohort study. Used as the federal government cross-check on the peer-reviewed lifetime figures.
   

   Independence note: NSDUH (SAMHSA) is a separate survey from both NESARC-III and NCS-R, with its own sampling design and screening instrument. The past-year estimate is consistent with but methodologically independent of the lifetime prevalence figures above.

   Source date: 2021-12-31 · Accessed: 2026-04-19

2. [2] Untreated depression Risk

   Statistic

   8.3% of US adults had past-year MDE in 2021 (21.0 million); 61.0% received treatment; 39.0% received no mental health treatment

   “"An estimated 21.0 million adults in the United States had at least one major depressive episode. This number represented 8.3% of all U.S. adults. [...] In 2021, an estimated 61.0% U.S. adults aged 18 or older with major depressive episode received treatment in the past year."”

   Calculation notes

   Treatment rate 61.0% implies 39.0% no-treatment rate. 21.0 million adults had past-year MDE; 39.0% × 21.0 million = approximately 8.2 million adults with MDE received no treatment in 2021. This is the native figure: 39 in 100 adults with MDE. The NIMH page uses 2021 NSDUH data and does not report lifetime MDD prevalence; the 20% lifetime figure used in the normalized assumptions comes from the NCS-R (Kessler et al. 2005, Arch Gen Psychiatry) and is widely replicated.
   

   Source date: 2023-01-01 · Accessed: 2026-05-04

Also cited in these entries

HealthDirect

Major depression

What are the odds of experiencing a major depressive episode in your lifetime?

1 in 4.9 lifetime(21%)

HealthDirect

Untreated depression

What fraction of US adults who develop major depression or an anxiety disorder receive no mental health treatment for at least a year?

1 in 13 lifetime(8.0%)