What it is
Adolescence is when most lifetime mental health conditions first appear. Unlike the service-coverage topics on this site, there is no agreed global measure of whether adolescents who need mental health care receive it. What exists is an estimate of how many are affected, and a body of work on how the missing measures should be built.
Why it matters
What is known about adolescent mental health
- 01The scale is established even where the measurement is notIn 2019 it was estimated that one in seven adolescents experiences a mental disorder — around 166 million adolescents globally, 89 million boys and 77 million girls.
- 02Adolescence is when conditions emergeThis is a formative period in which individuals begin the transition from childhood to adulthood. Conditions that appear here often persist, and support at this stage shapes the whole of adult life.
- 03It compounds other outcomesMental health conditions affect education, employment and physical health, and are themselves classified among non-communicable diseases.
- 04Unmeasured needs go unfundedBudget allocation and accountability both work from indicators. A need that no indicator records is structurally easy to leave out of a plan.
Where we are
The prevalence is estimated; the response is not measured
The service-coverage topics on this site each have a coverage figure — a percentage of a population that received a defined service. For adolescent mental health there is not. No global indicator records how many adolescents needing care receive it, what that care consists of, or whether it helped. (Not every topic here measures coverage: early childbearing is an outcome, and the non-communicable disease page reports risk behaviours. Neither of those is a coverage gap in the sense described here.)
This is not an oversight in this site's compilation. It reflects the state of global measurement: the instruments, definitions and comparability work that coverage indicators depend on are still being built for this topic.
UNICEF's most recent global figure for adolescent mental health prevalence dates from 2019, and the topic page carrying it was last updated in 2021. That vintage is itself part of the finding.
What a complete picture would require, and what is currently published. The absence shown here is the subject of this page.
Not yet published
Not measured comparably across countries. Some national health facility assessments capture parts of it.
No global indicator
Prevalence tells you how many adolescents are affected. It does not tell you how many were reached, which is what a coverage indicator measures. The two are not substitutes, and only the first exists globally.
What is measured
Why this is hard to measure, and what is being done
Mental health resists the measurement pattern that works elsewhere. Many service indicators can be built around a discrete contact or intervention — imperfectly, since recall, dose definitions and denominators all introduce error, but around something that either happened or did not. Mental health status is a matter of degree, is reported by the person experiencing it, and is described differently across languages and cultures, so an instrument that works in one setting may not carry to another. Determining who needed care is itself a measurement problem, before any question of whether they received it.
This is tractable rather than hopeless, and it is being worked on. UNICEF and partners have published a conceptual framework and road map for measuring adolescent mental health, a set of proposed adolescent mental health indicators, and the MMAPP toolkit for population-level measurement. This site hosts the MMAPP toolkit.
- Prevalence
- The share of a population living with a condition at a given time. This is what the one-in-seven estimate describes.
- Coverage
- The share of a population needing a service that received it. This exists for the service-coverage topics on this site and does not exist here.
- MMAPP
- Measuring Mental Health Among Adolescents and Young People at the Population Level — a toolkit of instruments and guidance for countries building this measurement.
Read these figures with care
- The one-in-seven figure is a modelled estimate from 2019, not a measurement from a recent survey round.
- Prevalence estimates for mental health carry wide uncertainty, and that uncertainty is larger in the countries with the least survey data.
- No global coverage indicator exists, so this page cannot tell you whether the situation is improving or worsening.
- Where national data do exist they are rarely comparable between countries, because instruments and case definitions differ.
Where to get the data
Where to find the data
- MMAPP toolkitInstruments and guidance for measuring adolescent mental healthGo to MMAPP toolkit
- UNICEF global databasesPrevalence estimates and the measurement literatureOpen to UNICEF global databases(opens in a new tab)
- Country profilesStandardized indicators, country by countryGo to Country profiles
References
- UNICEF, Mental health, UNICEF Data, October 2021.
- UNICEF, Measuring Mental Health Among Adolescents and Young People at the Population Level (MMAPP) Toolkit.
- UNICEF, A conceptual framework and road map to measuring mental health among adolescents.
- UNICEF, You can't manage what you do not measure: Why adolescent mental health monitoring matters.
Related topics
Copy last reviewed July 2026.