How often it is a primary outcome
Picture Naming Test43% of 466 studies
Vocabulary Test37% of 199 studies
Token Commands Task33% of 36 studies
Lexical Decision Task32% of 22 studies
Serial Naming Task32% of 22 studies
Clinical trials data
Every registered study on ClinicalTrials.gov that names the Vocabulary Test in an outcome measure: the conditions it is used in, how often it is a primary outcome, the tests it is named with, and how large the studies are.
Autism21 studies, 7 as a primary outcome
Cancer9 studies, 2 as a primary outcome
Aging, frailty and exercise9 studies, 2 as a primary outcome
Hearing loss9 studies, 3 as a primary outcome
Cardiovascular disease9 studies, 4 as a primary outcome
Epilepsy9 studies, 2 as a primary outcome
Brain injury and concussion8 studies, 3 as a primary outcome
Obesity and diabetes8 studies, 3 as a primary outcome
Stroke7 studies, 2 as a primary outcome
Depression and bipolar disorder7 studies, 3 as a primary outcome
Healthy volunteers7 studies, 2 as a primary outcome
Cognitive impairment and decline6 studies, 4 as a primary outcome
Dementia and Alzheimer's5 studies, 1 as a primary outcome
Schizophrenia and psychosis4 studies, 1 as a primary outcome
Substance use and addiction4 studies, 2 as a primary outcome
Sleep and sleep disorders4 studies, 1 as a primary outcome
Anxiety, PTSD and OCD4 studies, 1 as a primary outcome
Mild cognitive impairment3 studies, 2 as a primary outcome
Pain and fatigue2 studies, 0 as a primary outcome
Parkinson's disease1 study, 0 as a primary outcome
Multiple sclerosis1 study, 1 as a primary outcome
ADHD1 study, 1 as a primary outcome
Other conditions84 studies, 34 as a primary outcome
A test as a primary outcomeOnly in secondary or other outcomes
Picture Naming Test43% of 466 studies
Vocabulary Test37% of 199 studies
Token Commands Task33% of 36 studies
Lexical Decision Task32% of 22 studies
Serial Naming Task32% of 22 studies
A test as a primary outcomeOnly in secondary or other outcomes
| Start year | Studies | A test as a primary outcome |
|---|---|---|
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 2 | 2 |
| 2007 | 1 | 0 |
| 2008 | 6 | 2 |
| 2009 | 2 | 1 |
| 2010 | 6 | 1 |
| 2011 | 2 | 1 |
| 2012 | 6 | 1 |
| 2013 | 2 | 1 |
| 2014 | 8 | 3 |
| 2015 | 7 | 4 |
| 2016 | 8 | 2 |
| 2017 | 9 | 7 |
| 2018 | 7 | 4 |
| 2019 | 16 | 5 |
| 2020 | 14 | 7 |
| 2021 | 13 | 4 |
| 2022 | 18 | 10 |
| 2023 | 23 | 9 |
| 2024 | 14 | 4 |
| 2025 | 16 | 2 |
| 2026 | 12 | 1 |
| Phase | Studies with a size | Median | Middle half |
|---|---|---|---|
| Phase 2 | 20 | 60 | 38 to 112 |
| Not applicable | 105 | 60 | 30 to 144 |
| Observational | 38 | 177 | 59 to 622 |
A test as a primary outcomeOnly in secondary or other outcomes
170 of the 193 outcome measures give a duration. A single visit counts as within a day.
Intervention types as registered. A study can list several; observational studies often list none.
21 countries in all. A study with sites in several counts in each; 9 list no site.
Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.
Completed studies that name the Vocabulary Test: 56 of 100, 56%
Every completed study with a cognitive outcome: 3,626 of 7,953, 46%
| Results | Completed studies that name the Vocabulary Test | Every completed study |
|---|---|---|
| Results on ClinicalTrials.gov and a paper | 14, 14% | 776, 10% |
| Results on ClinicalTrials.gov only | 26, 26% | 1,139, 14% |
| A results paper only | 16, 16% | 1,711, 22% |
| Neither | 44, 44% | 4,327, 54% |
Picture Order Memory Test43 studies, 13 as a primary outcome
Pattern and Letter Comparison42 studies, 13 as a primary outcome
Size Order Memory Test41 studies, 13 as a primary outcome
Dimensional Change Card Sort39 studies, 13 as a primary outcome
Verbal Learning34 studies, 13 as a primary outcome
Digit Span Test21 studies, 12 as a primary outcome
Matrix Reasoning18 studies, 9 as a primary outcome
Verbal Fluency17 studies, 8 as a primary outcome
Trail Making Test15 studies, 8 as a primary outcome
Symbol Coding14 studies, 6 as a primary outcome
A test as a primary outcomeOnly in secondary or other outcomes
The panel's testThe other tests chosenEvery panel has the same scale. 2026 is partly planned starts.
| Start year | Vocabulary Test | Picture Order Memory Test | Pattern and Letter Comparison | Size Order Memory Test |
|---|---|---|---|---|
| 2000 | 1 | 0 | 0 | 0 |
| 2001 | 0 | 0 | 0 | 0 |
| 2002 | 0 | 0 | 0 | 0 |
| 2003 | 1 | 0 | 0 | 0 |
| 2004 | 0 | 0 | 0 | 0 |
| 2005 | 0 | 0 | 0 | 0 |
| 2006 | 2 | 0 | 0 | 0 |
| 2007 | 1 | 0 | 0 | 0 |
| 2008 | 6 | 0 | 0 | 0 |
| 2009 | 2 | 0 | 0 | 0 |
| 2010 | 6 | 0 | 0 | 0 |
| 2011 | 2 | 0 | 0 | 0 |
| 2012 | 6 | 0 | 0 | 0 |
| 2013 | 2 | 1 | 0 | 1 |
| 2014 | 8 | 0 | 1 | 1 |
| 2015 | 7 | 3 | 2 | 2 |
| 2016 | 8 | 2 | 3 | 4 |
| 2017 | 9 | 9 | 8 | 8 |
| 2018 | 7 | 14 | 9 | 15 |
| 2019 | 16 | 15 | 14 | 13 |
| 2020 | 14 | 6 | 10 | 10 |
| 2021 | 13 | 19 | 19 | 18 |
| 2022 | 18 | 12 | 13 | 13 |
| 2023 | 23 | 17 | 19 | 22 |
| 2024 | 14 | 13 | 13 | 15 |
| 2025 | 16 | 21 | 17 | 20 |
| 2026 | 12 | 10 | 18 | 18 |
199 studies match. 73 name the Vocabulary Test in a primary outcome. Median size 66 participants. Median time to the primary outcome: 6 months.
Loading 199 studies; the filters turn on when they arrive.
2026 is partly planned starts. Not shown: 2 that started before 2000 and 3 planned to start after 2026.
| Start year | Studies | As a primary outcome |
|---|---|---|
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 2 | 2 |
| 2007 | 1 | 0 |
| 2008 | 6 | 2 |
| 2009 | 2 | 1 |
| 2010 | 6 | 1 |
| 2011 | 2 | 1 |
| 2012 | 6 | 1 |
| 2013 | 2 | 1 |
| 2014 | 8 | 3 |
| 2015 | 7 | 4 |
| 2016 | 8 | 2 |
| 2017 | 9 | 7 |
| 2018 | 7 | 4 |
| 2019 | 16 | 5 |
| 2020 | 14 | 7 |
| 2021 | 13 | 4 |
| 2022 | 18 | 10 |
| 2023 | 23 | 9 |
| 2024 | 14 | 4 |
| 2025 | 16 | 2 |
| 2026 | 12 | 1 |
Lead sponsor: industry 19, other 180. Interventional 161, observational 38.
As a primary outcomeSecondary or other outcomeThe Vocabulary Test
Each number opens the study's record on ClinicalTrials.gov.
| Study | Start | Phase | Conditions | Participants | Lead sponsor | Status | Library tests named, with the latest time point |
|---|---|---|---|---|---|---|---|
| NCT07863778 | Start2025 | PhaseNot applicable | ConditionsOther conditions | Participants64 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT07861867 | Start2027 | PhasePhase 2 | ConditionsStroke, Aging, frailty and exercise | Participants60 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07654231 | Start2026 | PhasePhase 2 | ConditionsCardiovascular disease | Participants60 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07630506 | Start2025 | PhasePhase 2 | ConditionsAutism | Participants184 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07624747 | Start2025 | PhaseObservational | ConditionsOther conditions | Participants72 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07598643 | Start2026 | PhasePhase 2 | ConditionsOther conditions | Participants92 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07546942 | Start2026 | PhasePhase 1/2 | ConditionsAutism | Participants50 | Lead sponsorIndustry | StatusRecruiting | Library tests named
|
| NCT07531940 | Start2026 | PhasePhase 1 | ConditionsDementia and Alzheimer's | Participants25 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07459803 | Start2026 | PhaseNot applicable | ConditionsHealthy volunteers | Participants90 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07453537 | Start2026 | PhaseNot applicable | ConditionsCognitive impairment and decline | Participants84 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07451262 | Start2022 | PhaseNot applicable | ConditionsOther conditions | Participants537 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT07447427 | Start2026 | PhaseObservational | ConditionsHearing loss | Participants60 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07285629 | Start2025 | PhaseEarly phase 1 | ConditionsHealthy volunteers | Participants14 | Lead sponsorIndustry | StatusCompleted | Library tests named
|
| NCT07218653 | Start2026 | PhaseEarly phase 1 | ConditionsObesity and diabetes | Participants72 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07216781 | Start2025 | PhasePhase 1 | ConditionsHealthy volunteers | Participants14 | Lead sponsorIndustry | StatusActive, not recruiting | Library tests named
|
| NCT07091344 | Start2024 | PhaseNot applicable | ConditionsSchizophrenia and psychosis | Participants30 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07072104 | Start2025 | PhaseNot applicable | ConditionsOther conditions | Participants45 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07048392 | Start2025 | PhaseNot applicable | ConditionsOther conditions | Participants28 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT06995014 | Start2024 | PhaseNot applicable | ConditionsOther conditions | Participants7 | Lead sponsorOther | StatusStopped early | Library tests named
|
| NCT06930170 | Start2026 | PhaseNot applicable | ConditionsHearing loss | Participants36 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06926166 | Start2019 | PhaseObservational | ConditionsObesity and diabetes | Participants20,000 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06873841 | Start2025 | PhaseNot applicable | ConditionsOther conditions | Participants150 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06868979 | Start2026 | PhaseNot applicable | ConditionsOther conditions | Participants118 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06867198 | Start2025 | PhaseNot applicable | ConditionsObesity and diabetes, Cardiovascular disease | Participants72 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06828003 | Start2025 | PhaseNot applicable | ConditionsCancer | Participants30 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
199 registered studies on ClinicalTrials.gov name it in an outcome measure, 73 of them in a primary outcome.
Most often in autism (21), cancer (9) and aging, frailty and exercise (9).
1.2% of the studies that started in 2021 to 2025 name it, against 1.2% of those that started in 2016 to 2020: a share 1% smaller.
The Picture Order Memory Test (43 studies), Pattern and Letter Comparison (42 studies) and the Size Order Memory Test (41 studies).
Half of the phase 2 studies that name it enroll 60 participants or fewer, and the middle half enroll 38 to 112. 20 of them give a size.
Half of the primary outcomes that name the Vocabulary Test are measured within 6 months of the start, and the middle half from 6 weeks to 12 months. 64 primary outcomes give a duration.
56 of the 100 completed studies that name it, 56%, have reported results: 40 posted them on ClinicalTrials.gov, 30 have a results paper linked to the registry record, and 14 did both. The other 44 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.
For each test family, the census runs ClinicalTrials.gov's own outcome search for the family's names and reads every study first posted by the day the family was counted. These studies were read on 10 November 2026. A study counts once on a page, however many tests it names. Counts for a test cover every version of the task under any of its names, so a page can count studies that used a commercial version.
The census adds two things to each record and changes nothing in it: which outcome list names the test (primary, then secondary, then other), and the condition groups, matched on the study's condition names and MeSH terms. A study can fall in several groups; one whose only condition is cognitive impairment or decline falls in “Cognitive impairment and decline”. Studies that name only instruments outside the library count in every total and share but are not listed.
A second read on 10 November 2026 added each study's overall status, whether results are posted, its intervention types, the countries of its sites and the time frame of the outcome that names each test. A time frame counts by the latest time point it names: “Baseline, 12 and 24 weeks” is 24 weeks, a single visit is within a day, and one that names no duration, such as “end of treatment”, is left out of the timings.
A third read on 10 November 2026 added the papers the registry links to each study: those its sponsor lists as reporting results, and those PubMed links to it through the study's NCT number. A study has a results paper when one of them came out in or after the month of its primary completion and PubMed does not class it as a protocol, review or comment. A paper that never gives the NCT number is not linked, so some studies counted as reporting neither did publish.
Source: ClinicalTrials.gov, a database of the U.S. National Library of Medicine, which does not endorse these pages. Every study line is in the data release 2.1.0, and the explorer's own file is clinical-trials-studies.json.
Choose tests with a record in registered trials, and run them in a browser at every site, on the same version each visit.