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    1. Verbal Fluency TestGradeA
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    16,361Registered studies name a cognitive test in an outcome measure11,688 name a test you can run hereExplore the studies
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  1. Home
  2. /Data
  3. /Clinical trials
  4. /Conditions
  5. /Anxiety, PTSD and OCD
  6. /Verbal Fluency

Clinical trials data

Verbal Fluency in anxiety, PTSD and OCD trials: 61 registered studies

Every registered anxiety, PTSD and OCD study on ClinicalTrials.gov that names Verbal Fluency in an outcome measure: how often it is a primary outcome, the tests named with it, how large the studies are and when they measure it.

Registered anxiety, PTSD and OCD studies name it in an outcome measure
61
Name it in a primary outcome, 38%
23 of 61
Of the condition's 692 studies name it, against 11% of all registered studies
9%
Other conditions
Median participants per study
80
By phase
Try Verbal Fluency

Tests named in the same studies

The library tests that anxiety, PTSD and OCD studies naming Verbal Fluency name most often beside it.
  1. 1

    Trail Making Test27 studies, 12 as a primary outcome

  2. 2

    Digit Span Test25 studies, 10 as a primary outcome

  3. 3

    Verbal Learning22 studies, 11 as a primary outcome

  4. 4

    Stroop Color-Word Test13 studies, 2 as a primary outcome

  5. 5

    Category Fluency10 studies, 7 as a primary outcome

  6. 6

    Continuous Performance Test9 studies, 4 as a primary outcome

  7. 7

    Paced Visual Serial Addition Test8 studies, 4 as a primary outcome

  8. 8

    Symbol Coding8 studies, 3 as a primary outcome

  9. 9

    Card Sorting Test (Berg)5 studies, 2 as a primary outcome

  10. 10

    Short Story Recall5 studies, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Studies by start year

Each study counted once. 2026 is partly planned starts.
02000: 0 studies, 0 with a test as a primary outcome20002001: 0 studies, 0 with a test as a primary outcome2002: 0 studies, 0 with a test as a primary outcome2003: 0 studies, 0 with a test as a primary outcome2004: 0 studies, 0 with a test as a primary outcome2005: 0 studies, 0 with a test as a primary outcome20052006: 0 studies, 0 with a test as a primary outcome2007: 2 studies, 2 with a test as a primary outcome2008: 1 studies, 1 with a test as a primary outcome2009: 1 studies, 0 with a test as a primary outcome2010: 0 studies, 0 with a test as a primary outcome20102011: 2 studies, 1 with a test as a primary outcome2012: 0 studies, 0 with a test as a primary outcome2013: 3 studies, 1 with a test as a primary outcome2014: 0 studies, 0 with a test as a primary outcome2015: 4 studies, 4 with a test as a primary outcome20152016: 2 studies, 1 with a test as a primary outcome2017: 6 studies, 1 with a test as a primary outcome2018: 5 studies, 0 with a test as a primary outcome2019: 3 studies, 1 with a test as a primary outcome2020: 4 studies, 1 with a test as a primary outcome20202021: 7 studies, 3 with a test as a primary outcome2022: 5 studies, 1 with a test as a primary outcome2023: 4 studies, 2 with a test as a primary outcome2024: 4 studies, 1 with a test as a primary outcome2025: 4 studies, 2 with a test as a primary outcome20252026: 3 studies, 1 with a test as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table
Registered studies by start year
Start yearStudiesA test as a primary outcome
200000
200100
200200
200300
200400
200500
200600
200722
200811
200910
201000
201121
201200
201331
201400
201544
201621
201761
201850
201931
202041
202173
202251
202342
202441
202542
202631

Phases and study sizes

By phase

  • Early phase 13 studies, 1 as a primary outcome
  • Phase 1/23 studies, 2 as a primary outcome
  • Phase 26 studies, 1 as a primary outcome
  • Phase 31 studies, 1 as a primary outcome
  • Phase 41 studies, 0 as a primary outcome
  • Not applicable41 studies, 15 as a primary outcome
  • Observational6 studies, 3 as a primary outcome

Participants per study

102050100200
  • Not applicable88 median, 48 to 153
Participants per study. The bar spans the middle half of the studies in each phase, the mark is the median, and the axis is logarithmic. Phases with fewer than 10 studies that give a size are left out.
Show as a table
Participants per anxiety, PTSD and OCD study that names Verbal Fluency, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable408848 to 153

When anxiety, PTSD and OCD trials measure it

Half of the primary outcomes that name Verbal Fluency are measured within 13 weeks of the start, and the middle half from 10 weeks to 6 months. 21 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day6 outcomes, 1 as a primary outcome
  • Up to 4 weeks5 outcomes, 1 as a primary outcome
  • 1 to 3 months23 outcomes, 10 as a primary outcome
  • 3 to 6 months15 outcomes, 7 as a primary outcome
  • 6 to 12 months5 outcomes, 1 as a primary outcome
  • 1 to 2 years2 outcomes, 1 as a primary outcome
  • Over 2 years3 outcomes, 0 as a primary outcome
  • No duration given2 outcomes, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

59 of the 61 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting10 studies, 3 as a primary outcome
  • Not yet recruiting4 studies, 1 as a primary outcome
  • Active, not recruiting3 studies, 2 as a primary outcome
  • Completed28 studies, 14 as a primary outcome
  • Stopped early9 studies, 2 as a primary outcome
  • Status unknown7 studies, 1 as a primary outcome

What they test

  • Behavioral24 studies, 13 as a primary outcome
  • Drug13 studies, 6 as a primary outcome
  • Device10 studies, 1 as a primary outcome
  • Dietary supplement1 studies, 0 as a primary outcome
  • Procedure2 studies, 1 as a primary outcome
  • Diagnostic test2 studies, 1 as a primary outcome
  • Biological1 studies, 0 as a primary outcome
  • Radiation2 studies, 1 as a primary outcome
  • Other11 studies, 1 as a primary outcome
  • None given3 studies, 2 as a primary outcome

Intervention types as registered. A study can list several; observational studies often list none.

Where their sites are

  • United States29 studies, 9 as a primary outcome
  • Canada7 studies, 4 as a primary outcome
  • Denmark3 studies, 1 as a primary outcome
  • France3 studies, 0 as a primary outcome
  • Spain3 studies, 2 as a primary outcome
  • Argentina2 studies, 1 as a primary outcome
  • China2 studies, 1 as a primary outcome
  • Netherlands2 studies, 1 as a primary outcome
  • Chile1 studies, 0 as a primary outcome
  • Finland1 studies, 1 as a primary outcome
  • Germany1 studies, 0 as a primary outcome
  • Hong Kong1 studies, 0 as a primary outcome

15 countries in all. A study with sites in several counts in each; 3 list no site.

Reported results

Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.

Completed anxiety, PTSD and OCD studies that name Verbal Fluency: 15 of 28, 54%

Every completed study with a cognitive outcome: 3,626 of 7,953, 46%

Completed anxiety, PTSD and OCD studies that name Verbal Fluency and every completed study, by how they reported results
ResultsCompleted anxiety, PTSD and OCD studies that name Verbal FluencyEvery completed study
Results on ClinicalTrials.gov and a paper3, 11%776, 10%
Results on ClinicalTrials.gov only6, 21%1,139, 14%
A results paper only6, 21%1,711, 22%
Neither13, 46%4,327, 54%

The 61 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionAnxiety, PTSD and OCD
TestVerbal Fluency

61 studies match. 23 name Verbal Fluency in a primary outcome. Median size 80 participants. Median time to the primary outcome: 13 weeks.

Loading 61 studies; the filters turn on when they arrive.

By start year
024682000: 0 studies, 0 naming Verbal Fluency in a primary outcome20002001: 0 studies, 0 naming Verbal Fluency in a primary outcome2002: 0 studies, 0 naming Verbal Fluency in a primary outcome2003: 0 studies, 0 naming Verbal Fluency in a primary outcome2004: 0 studies, 0 naming Verbal Fluency in a primary outcome2005: 0 studies, 0 naming Verbal Fluency in a primary outcome20052006: 0 studies, 0 naming Verbal Fluency in a primary outcome2007: 2 studies, 2 naming Verbal Fluency in a primary outcome2008: 1 studies, 1 naming Verbal Fluency in a primary outcome2009: 1 studies, 0 naming Verbal Fluency in a primary outcome2010: 0 studies, 0 naming Verbal Fluency in a primary outcome20102011: 2 studies, 1 naming Verbal Fluency in a primary outcome2012: 0 studies, 0 naming Verbal Fluency in a primary outcome2013: 3 studies, 1 naming Verbal Fluency in a primary outcome2014: 0 studies, 0 naming Verbal Fluency in a primary outcome2015: 4 studies, 4 naming Verbal Fluency in a primary outcome20152016: 2 studies, 1 naming Verbal Fluency in a primary outcome2017: 6 studies, 1 naming Verbal Fluency in a primary outcome2018: 5 studies, 0 naming Verbal Fluency in a primary outcome2019: 3 studies, 1 naming Verbal Fluency in a primary outcome2020: 4 studies, 1 naming Verbal Fluency in a primary outcome20202021: 7 studies, 3 naming Verbal Fluency in a primary outcome2022: 5 studies, 1 naming Verbal Fluency in a primary outcome2023: 4 studies, 2 naming Verbal Fluency in a primary outcome2024: 4 studies, 1 naming Verbal Fluency in a primary outcome2025: 4 studies, 2 naming Verbal Fluency in a primary outcome20252026: 3 studies, 1 naming Verbal Fluency in a primary outcome

2026 is partly planned starts. Not shown: 1 planned to start after 2026.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200100
200200
200300
200400
200500
200600
200722
200811
200910
201000
201121
201200
201331
201400
201544
201621
201761
201850
201931
202041
202173
202251
202342
202441
202542
202631

Library tests named most

  • Verbal Fluency61 studies, 23 as a primary outcome
  • Trail Making Test27 studies, 12 as a primary outcome
  • Digit Span Test25 studies, 10 as a primary outcome
  • Verbal Learning22 studies, 11 as a primary outcome
  • Stroop Color-Word Test13 studies, 2 as a primary outcome
  • Category Fluency10 studies, 7 as a primary outcome
  • Continuous Performance Test9 studies, 4 as a primary outcome
  • Paced Visual Serial Addition Test8 studies, 4 as a primary outcome
  • Symbol Coding8 studies, 3 as a primary outcome
  • Card Sorting Test (Berg)5 studies, 2 as a primary outcome

Largest condition groups

  • Anxiety, PTSD and OCD61 studies, 23 as a primary outcome
  • Depression and bipolar disorder26 studies, 9 as a primary outcome
  • Pain and fatigue10 studies, 3 as a primary outcome
  • Brain injury and concussion8 studies, 4 as a primary outcome
  • Cancer7 studies, 3 as a primary outcome
  • Sleep and sleep disorders5 studies, 1 as a primary outcome
  • Parkinson's disease3 studies, 0 as a primary outcome
  • Schizophrenia and psychosis3 studies, 2 as a primary outcome
  • COVID-19 and long COVID3 studies, 0 as a primary outcome
  • Stroke2 studies, 1 as a primary outcome
  • Aging, frailty and exercise2 studies, 0 as a primary outcome
  • Delirium, surgery and intensive care2 studies, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 3, other 58. Interventional 55, observational 6.

As a primary outcomeSecondary or other outcomeVerbal Fluency

The studies, newest registration first

Each number opens the study's record on ClinicalTrials.gov.

Registered studies that match the filters, newest registration first, with the library tests each one names and the outcome list that names them.
StudyStartPhaseConditionsParticipantsLead sponsorStatusLibrary tests named, with the latest time point
NCT07755839Start2026PhaseNot applicableConditionsDepression and bipolar disorder, Cancer, Anxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Cancellation TestSecondary6 months
NCT07693686Start2027PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants176Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningOther outcome10 weeks
  • Verbal FluencyOther outcome10 weeks
  • Digit Span TestOther outcome10 weeks
  • Continuous Performance TestOther outcome10 weeks
  • Choice Reaction TimeOther outcome10 weeks
  • AX Continuous Performance TestOther outcome10 weeks
  • Letter-Number Sequencing TaskOther outcome10 weeks
NCT07506070Start2026PhaseNot applicableConditionsSchizophrenia and psychosis, Depression and bipolar disorder, Autism, Anxiety, PTSD and OCDParticipants160Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningPrimary13 weeks
  • Verbal FluencyPrimary13 weeks
NCT07393672Start2026PhasePhase 2ConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants104Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Stroop Color-Word TestSecondary13 weeks
  • Verbal LearningSecondary13 weeks
  • Verbal FluencySecondary13 weeks
  • Digit Span TestSecondary13 weeks
  • Symbol CodingSecondary
  • N-Back TaskSecondary13 weeks
  • Go/No-Go TaskSecondary13 weeks
  • Simple Reaction TimeSecondary13 weeks
  • Corsi Block-Tapping TestSecondary13 weeks
NCT07309302Start2025PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants64Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary5 months
  • Stroop Color-Word TestPrimary5 months
  • Verbal LearningPrimary5 months
  • Verbal FluencyPrimary5 months
  • Symbol CodingPrimary5 months
  • Continuous Performance TestPrimary5 months
  • Category FluencyPrimary5 months
  • Eriksen Flanker TaskPrimary5 months
  • Balloon RiskPrimary5 months
  • Emotional Stroop TaskPrimary5 months
  • Visual Search TestPrimary5 months
  • Serial Naming TaskPrimary5 months
NCT07273604Start2015PhaseNot applicableConditionsMultiple sclerosis, Depression and bipolar disorder, Anxiety, PTSD and OCD, Pain and fatigueParticipants148Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal FluencyPrimary12 weeks
  • Symbol CodingPrimary12 weeks
  • Category FluencyPrimary12 weeks
  • Paced Visual Serial Addition TestPrimary12 weeks
  • Selective Reminding TaskPrimary12 weeks
NCT06897553Start2024PhaseNot applicableConditionsBrain injury and concussion, Depression and bipolar disorder, COVID-19 and long COVID, Anxiety, PTSD and OCDParticipants44Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary8 weeks
  • Verbal FluencySecondary8 weeks
NCT06848127Start2025PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants170Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal FluencySecondary3 years
  • Emotional Stroop TaskSecondary3 years
  • Negative Priming TaskSecondary3 years
NCT06831916Start2025PhasePhase 2ConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants104Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Stroop Color-Word TestSecondary13 weeks
  • Verbal LearningSecondary13 weeks
  • Verbal FluencySecondary13 weeks
  • Digit Span TestSecondary13 weeks
  • Symbol CodingSecondary
  • N-Back TaskSecondary13 weeks
  • Go/No-Go TaskSecondary13 weeks
  • Simple Reaction TimeSecondary13 weeks
  • Corsi Block-Tapping TestSecondary13 weeks
  • DRM False Memory TaskSecondary13 weeks
NCT06816667Start2024PhasePhase 1/2ConditionsDepression and bipolar disorder, Healthy volunteers, Anxiety, PTSD and OCDParticipants40Lead sponsorIndustryStatusCompleted

Paper

Library tests named
  • Verbal FluencySecondary5 weeks
  • Digit Span TestSecondary5 weeks
  • Paced Visual Serial Addition TestSecondary5 weeks
NCT06812221Start2024PhasePhase 1/2ConditionsMild cognitive impairment, Depression and bipolar disorder, Anxiety, PTSD and OCDParticipants20Lead sponsorIndustryStatusCompletedLibrary tests named
  • Verbal FluencyPrimary5 weeks
  • Digit Span TestPrimary5 weeks
  • Paced Visual Serial Addition TestPrimary5 weeks
NCT06809218Start2022PhasePhase 3ConditionsAnxiety, PTSD and OCD, Delirium, surgery and intensive careParticipants312Lead sponsorIndustryStatusActive, not recruitingLibrary tests named
  • Verbal FluencyPrimary13 weeks
  • Digit Span TestPrimary13 weeks
  • Sentence Completion Inhibition TestPrimary13 weeks
NCT06804304Start2025PhaseNot applicableConditionsStroke, Depression and bipolar disorder, Anxiety, PTSD and OCDParticipants100Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal FluencyPrimary13 weeks
  • Digit Span TestPrimary13 weeks
  • Short Story RecallSecondary6 months
  • Cancellation TestSecondary6 months
  • Sustained Attention to ResponsePrimary13 weeks
  • Simon TaskPrimary13 weeks
NCT06769243Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants30Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary4 weeks
  • Verbal FluencyPrimary4 weeks
  • Category FluencyPrimary4 weeks
  • Card Sorting Test (Berg)Primary4 weeks
  • Task Switching TestPrimary4 weeks
NCT06429956Start2024PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants93Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestOther outcomesame day
  • Stroop Color-Word TestOther outcomesame day
  • Verbal FluencyOther outcomesame day
  • Digit Span TestOther outcomesame day
NCT06063265Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants120Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary6 months
  • Verbal FluencyPrimary6 months
  • Digit Span TestPrimary6 months
  • Category FluencyPrimary6 months
NCT06032377Start2023PhaseNot applicableConditionsDepression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCDParticipants275Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal LearningSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Symbol CodingSecondary6 months
  • Picture Naming TestSecondary6 months
  • Short Story RecallSecondary6 months
  • Paired Associate LearningSecondary6 months
  • Rapid Visual Information ProcessingSecondary6 months
  • Intra/Extra Dimensional Set ShiftPrimary6 months
  • Pattern Recognition MemorySecondary6 months
NCT05950347Start2023PhaseNot applicableConditionsParkinson's disease, Anxiety, PTSD and OCDParticipants30Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Verbal FluencySecondarysame day
NCT05356988Start2022PhaseNot applicableConditionsDepression and bipolar disorder, Cancer, Aging, frailty and exercise, Sleep and sleep disorders, Anxiety, PTSD and OCD, Pain and fatigueParticipants415Lead sponsorOtherStatusCompleted

Paper 1Paper 2

Library tests named
  • Verbal FluencySecondary12 months
NCT05322343Start2022PhaseObservationalConditionsDementia and Alzheimer's, Depression and bipolar disorder, Aging, frailty and exercise, Anxiety, PTSD and OCDParticipants2,050Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal FluencySecondary3 years
  • Selective Reminding TaskSecondary3 years
NCT05289258Start2021PhaseNot applicableConditionsDepression and bipolar disorder, Cancer, Anxiety, PTSD and OCDParticipants123Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary
  • Verbal LearningPrimary
  • Verbal FluencyPrimary
NCT05254015Start2022PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants150Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal FluencyOther outcome12 months
  • Design Fluency TestOther outcome12 months
NCT05119400Start2021PhaseObservationalConditionsCOVID-19 and long COVID, Anxiety, PTSD and OCDParticipants2Lead sponsorOtherStatusStopped earlyLibrary tests named
  • Trail Making TestSecondary3 years
  • Stroop Color-Word TestSecondary3 years
  • Verbal FluencySecondary3 years
  • Attention Network TestSecondary3 years
NCT05019300Start2021PhaseObservationalConditionsDepression and bipolar disorder, Sleep and sleep disorders, COVID-19 and long COVID, Anxiety, PTSD and OCD, Pain and fatigueParticipants80Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Verbal FluencySecondary12 months
  • Tower PlanningSecondary12 months
  • Paired Associate LearningSecondary12 months
  • Rapid Visual Information ProcessingSecondary12 months
  • Intra/Extra Dimensional Set ShiftSecondary12 months
  • Betting Choice TaskSecondary12 months
NCT04846777Start2018PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants300Lead sponsorOtherStatusRecruiting

Paper 1Paper 2

Library tests named
  • Trail Making TestSecondary2 weeks
  • Verbal FluencySecondary2 weeks
  • Category FluencySecondary2 weeks
  • Emoji Emotion RecognitionSecondary2 weeks

Page 1 of 3

Questions, answered from the data

How many anxiety, PTSD and OCD trials use Verbal Fluency?

61 registered anxiety, PTSD and OCD studies on ClinicalTrials.gov name it in an outcome measure, 23 of them in a primary outcome: 9% of the condition's 692 studies with a cognitive outcome, against 11% of all of them. It is the 6th most named test in anxiety, PTSD and OCD trials.

Which tests do anxiety, PTSD and OCD trials use with Verbal Fluency?

The Trail Making Test (27 studies), the Digit Span Test (25 studies) and Verbal Learning (22 studies).

When do anxiety, PTSD and OCD trials measure Verbal Fluency?

Half of the primary outcomes that name Verbal Fluency are measured within 13 weeks of the start, and the middle half from 10 weeks to 6 months. 21 primary outcomes give a duration.

How many completed anxiety, PTSD and OCD trials that use Verbal Fluency have reported results?

15 of the 28 completed studies that name it, 54%, have reported results: 9 posted them on ClinicalTrials.gov, 9 have a results paper linked to the registry record, and 3 did both. The other 13 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on Verbal Fluency and anxiety, PTSD and OCD

  • Every cognitive test in anxiety, PTSD and OCD trials: 692 studies
  • Verbal Fluency in all clinical trials: 1,745 studies

Verbal Fluency in other conditions

  • Dementia and Alzheimer's248
  • Cancer200
  • Mild cognitive impairment177
  • Depression and bipolar disorder154
  • Parkinson's disease140
  • Aging, frailty and exercise136
  • Stroke110
  • Schizophrenia and psychosis107
  • Brain injury and concussion86
  • Cognitive impairment and decline63
  • Obesity and diabetes63
  • Cardiovascular disease61
  • Multiple sclerosis58
  • Sleep and sleep disorders58
  • Pain and fatigue53

Other tests in anxiety, PTSD and OCD trials

  • Stroop Color-Word Test79
  • Digit Span Test72
  • Verbal Learning70
  • Trail Making Test69
  • Go/No-Go Task63

How the studies are counted

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.

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