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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. /Obesity and diabetes
  6. /Verbal Learning

Clinical trials data

Verbal Learning in obesity and diabetes trials: 74 registered studies

Every registered obesity and diabetes study on ClinicalTrials.gov that names Verbal Learning 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 obesity and diabetes studies name it in an outcome measure
74
Name it in a primary outcome, 36%
27 of 74
Of the condition's 627 studies name it, against 11% of all registered studies
12%
Other conditions
Median participants per study
83
By phase
Try Verbal LearningTry the Grocery Trip Game

Tests named in the same studies

The library tests that obesity and diabetes studies naming Verbal Learning name most often beside it.
  1. 1

    Trail Making Test40 studies, 16 as a primary outcome

  2. 2

    Verbal Fluency31 studies, 14 as a primary outcome

  3. 3

    Digit Span Test30 studies, 13 as a primary outcome

  4. 4

    Stroop Color-Word Test28 studies, 11 as a primary outcome

  5. 5

    Symbol Coding22 studies, 13 as a primary outcome

  6. 6

    Category Fluency13 studies, 9 as a primary outcome

  7. 7

    Short Story Recall7 studies, 3 as a primary outcome

  8. 8

    Letter-Number Sequencing Task6 studies, 5 as a primary outcome

  9. 9

    Complex Figure Copy and Recall6 studies, 3 as a primary outcome

  10. 10

    Picture Naming Test6 studies, 3 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: 0 studies, 0 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: 1 studies, 0 with a test as a primary outcome20102011: 1 studies, 1 with a test as a primary outcome2012: 0 studies, 0 with a test as a primary outcome2013: 3 studies, 2 with a test as a primary outcome2014: 2 studies, 0 with a test as a primary outcome2015: 5 studies, 0 with a test as a primary outcome20152016: 7 studies, 2 with a test as a primary outcome2017: 3 studies, 0 with a test as a primary outcome2018: 7 studies, 2 with a test as a primary outcome2019: 5 studies, 2 with a test as a primary outcome2020: 2 studies, 0 with a test as a primary outcome20202021: 2 studies, 1 with a test as a primary outcome2022: 9 studies, 5 with a test as a primary outcome2023: 5 studies, 4 with a test as a primary outcome2024: 8 studies, 3 with a test as a primary outcome2025: 7 studies, 3 with a test as a primary outcome20252026: 4 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
200700
200811
200910
201010
201111
201200
201332
201420
201550
201672
201730
201872
201952
202020
202121
202295
202354
202483
202573
202641

Phases and study sizes

By phase

  • Phase 11 studies, 0 as a primary outcome
  • Phase 27 studies, 2 as a primary outcome
  • Phase 2/31 studies, 1 as a primary outcome
  • Phase 34 studies, 2 as a primary outcome
  • Phase 41 studies, 0 as a primary outcome
  • Not applicable42 studies, 14 as a primary outcome
  • Observational18 studies, 8 as a primary outcome

Participants per study

102050100200500
  • Not applicable71 median, 38 to 102
  • Observational122 median, 65 to 338
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 obesity and diabetes study that names Verbal Learning, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable427138 to 102
Observational1812265 to 338

When obesity and diabetes trials measure it

Half of the primary outcomes that name Verbal Learning are measured within 6 months of the start, and the middle half from 12 weeks to 12 months. 24 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day8 outcomes, 3 as a primary outcome
  • Up to 4 weeks5 outcomes, 1 as a primary outcome
  • 1 to 3 months15 outcomes, 5 as a primary outcome
  • 3 to 6 months19 outcomes, 5 as a primary outcome
  • 6 to 12 months8 outcomes, 4 as a primary outcome
  • 1 to 2 years4 outcomes, 2 as a primary outcome
  • Over 2 years10 outcomes, 4 as a primary outcome
  • No duration given5 outcomes, 3 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

69 of the 74 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting16 studies, 7 as a primary outcome
  • Not yet recruiting2 studies, 0 as a primary outcome
  • Active, not recruiting5 studies, 2 as a primary outcome
  • Completed45 studies, 15 as a primary outcome
  • Stopped early4 studies, 2 as a primary outcome
  • Status unknown2 studies, 1 as a primary outcome

What they test

  • Behavioral26 studies, 10 as a primary outcome
  • Drug13 studies, 4 as a primary outcome
  • Device2 studies, 1 as a primary outcome
  • Dietary supplement9 studies, 1 as a primary outcome
  • Procedure5 studies, 0 as a primary outcome
  • Biological1 studies, 0 as a primary outcome
  • Genetic1 studies, 0 as a primary outcome
  • Other20 studies, 9 as a primary outcome
  • None given9 studies, 5 as a primary outcome

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

Where their sites are

  • United States40 studies, 11 as a primary outcome
  • Spain7 studies, 3 as a primary outcome
  • China5 studies, 3 as a primary outcome
  • Canada4 studies, 1 as a primary outcome
  • Germany4 studies, 1 as a primary outcome
  • Denmark3 studies, 2 as a primary outcome
  • Greece2 studies, 1 as a primary outcome
  • Netherlands2 studies, 0 as a primary outcome
  • United Kingdom2 studies, 0 as a primary outcome
  • Australia1 studies, 1 as a primary outcome
  • Belgium1 studies, 0 as a primary outcome
  • Brazil1 studies, 1 as a primary outcome

16 countries in all. A study with sites in several counts in each; 2 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 obesity and diabetes studies that name Verbal Learning: 24 of 45, 53%

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

Completed obesity and diabetes studies that name Verbal Learning and every completed study, by how they reported results
ResultsCompleted obesity and diabetes studies that name Verbal LearningEvery completed study
Results on ClinicalTrials.gov and a paper8, 18%776, 10%
Results on ClinicalTrials.gov only4, 9%1,139, 14%
A results paper only12, 27%1,711, 22%
Neither21, 47%4,327, 54%

The 74 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionObesity and diabetes
TestVerbal Learning

74 studies match. 27 name Verbal Learning in a primary outcome. Median size 83 participants. Median time to the primary outcome: 6 months.

Loading 74 studies; the filters turn on when they arrive.

By start year
02.557.5102000: 0 studies, 0 naming Verbal Learning in a primary outcome20002001: 0 studies, 0 naming Verbal Learning in a primary outcome2002: 0 studies, 0 naming Verbal Learning in a primary outcome2003: 0 studies, 0 naming Verbal Learning in a primary outcome2004: 0 studies, 0 naming Verbal Learning in a primary outcome2005: 0 studies, 0 naming Verbal Learning in a primary outcome20052006: 0 studies, 0 naming Verbal Learning in a primary outcome2007: 0 studies, 0 naming Verbal Learning in a primary outcome2008: 1 studies, 1 naming Verbal Learning in a primary outcome2009: 1 studies, 0 naming Verbal Learning in a primary outcome2010: 1 studies, 0 naming Verbal Learning in a primary outcome20102011: 1 studies, 1 naming Verbal Learning in a primary outcome2012: 0 studies, 0 naming Verbal Learning in a primary outcome2013: 3 studies, 2 naming Verbal Learning in a primary outcome2014: 2 studies, 0 naming Verbal Learning in a primary outcome2015: 5 studies, 0 naming Verbal Learning in a primary outcome20152016: 7 studies, 2 naming Verbal Learning in a primary outcome2017: 3 studies, 0 naming Verbal Learning in a primary outcome2018: 7 studies, 2 naming Verbal Learning in a primary outcome2019: 5 studies, 2 naming Verbal Learning in a primary outcome2020: 2 studies, 0 naming Verbal Learning in a primary outcome20202021: 2 studies, 1 naming Verbal Learning in a primary outcome2022: 9 studies, 5 naming Verbal Learning in a primary outcome2023: 5 studies, 4 naming Verbal Learning in a primary outcome2024: 8 studies, 3 naming Verbal Learning in a primary outcome2025: 7 studies, 3 naming Verbal Learning in a primary outcome20252026: 4 studies, 1 naming Verbal Learning in a primary outcome

2026 is partly planned starts. Not shown: 1 that started before 2000.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200100
200200
200300
200400
200500
200600
200700
200811
200910
201010
201111
201200
201332
201420
201550
201672
201730
201872
201952
202020
202121
202295
202354
202483
202573
202641

Library tests named most

  • Verbal Learning74 studies, 27 as a primary outcome
  • Trail Making Test40 studies, 16 as a primary outcome
  • Verbal Fluency31 studies, 14 as a primary outcome
  • Digit Span Test30 studies, 13 as a primary outcome
  • Stroop Color-Word Test28 studies, 11 as a primary outcome
  • Symbol Coding22 studies, 13 as a primary outcome
  • Category Fluency13 studies, 9 as a primary outcome
  • Short Story Recall7 studies, 3 as a primary outcome
  • Letter-Number Sequencing Task6 studies, 5 as a primary outcome
  • Complex Figure Copy and Recall6 studies, 3 as a primary outcome

Largest condition groups

  • Obesity and diabetes74 studies, 27 as a primary outcome
  • Aging, frailty and exercise13 studies, 4 as a primary outcome
  • Dementia and Alzheimer's8 studies, 5 as a primary outcome
  • Cardiovascular disease7 studies, 3 as a primary outcome
  • Mild cognitive impairment6 studies, 5 as a primary outcome
  • Cancer3 studies, 0 as a primary outcome
  • Sleep and sleep disorders3 studies, 0 as a primary outcome
  • Delirium, surgery and intensive care3 studies, 1 as a primary outcome
  • Stroke2 studies, 2 as a primary outcome
  • Parkinson's disease1 study, 0 as a primary outcome
  • Depression and bipolar disorder1 study, 0 as a primary outcome
  • ADHD1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 3, NIH 2, other 69. Interventional 56, observational 18.

As a primary outcomeSecondary or other outcomeVerbal Learning

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
NCT07704229Start2026PhaseObservationalConditionsObesity and diabetesParticipants150Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary3 years
  • Stroop Color-Word TestSecondary3 years
  • Verbal LearningSecondary3 years
  • Digit Span TestSecondary3 years
  • Symbol CodingSecondary3 years
NCT07501377Start2026PhaseNot applicableConditionsObesity and diabetesParticipants120Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestOther outcome6 months
  • Stroop Color-Word TestOther outcome6 months
  • Verbal LearningSecondary6 months
  • Attention Network TestOther outcome6 months
  • Mnemonic Similarity TaskOther outcome6 months
NCT07485062Start2026PhasePhase 4ConditionsAging, frailty and exercise, Obesity and diabetesParticipants164Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestPrimary7 months
  • Stroop Color-Word TestSecondary7 months
  • Verbal LearningSecondary7 months
  • Digit Span TestSecondary7 months
  • Symbol CodingSecondary7 months
  • Eriksen Flanker TaskSecondary7 months
NCT07420699Start2023PhaseNot applicableConditionsObesity and diabetesParticipants40Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningPrimarysame day
  • Digit Span TestPrimarysame day
  • Symbol CodingPrimarysame day
  • Corsi Block-Tapping TestPrimarysame day
NCT07374705Start2026PhaseObservationalConditionsObesity and diabetesParticipants150Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary
  • Verbal LearningPrimary
  • Verbal FluencyPrimary
  • Digit Span TestPrimary
  • Symbol CodingPrimary
  • Letter-Number Sequencing TaskPrimary
NCT07284316Start2025PhasePhase 2/3ConditionsObesity and diabetesParticipants100Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Verbal LearningPrimary12 months
  • Verbal FluencyPrimary12 months
  • Symbol CodingPrimary12 months
  • Category FluencyPrimary12 months
NCT07203196Start2025PhaseNot applicableConditionsAging, frailty and exercise, Obesity and diabetes, Sleep and sleep disordersParticipants16Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Verbal LearningSecondary13 weeks
  • Dimensional Change Card SortSecondary13 weeks
  • Size Order Memory TestSecondary13 weeks
  • Pattern and Letter ComparisonSecondary13 weeks
  • Picture Order Memory TestSecondary13 weeks
NCT07164768Start2024PhaseObservationalConditionsObesity and diabetesParticipants400Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestPrimary3 years
  • Verbal LearningPrimary3 years
  • Verbal FluencyPrimary3 years
  • Digit Span TestPrimary3 years
  • Category FluencyPrimary3 years
  • Card Sorting Test (Berg)Primary3 years
  • Matrix ReasoningPrimary3 years
  • Cancellation TestPrimary3 years
  • Simple Reaction TimePrimary3 years
  • Letter-Number Sequencing TaskPrimary3 years
  • Finger Tapping TaskPrimary3 years
  • Symbol Scan TaskPrimary3 years
  • Token Commands TaskPrimary3 years
NCT07040748Start2025PhaseNot applicableConditionsObesity and diabetesParticipants84Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary6 months
  • Stroop Color-Word TestPrimary6 months
  • Verbal LearningPrimary6 months
  • Verbal FluencyPrimary6 months
  • Digit Span TestPrimary6 months
  • Symbol CodingPrimary6 months
  • Continuous Performance TestPrimary6 months
  • Category FluencyPrimary6 months
  • Card Sorting Test (Berg)Primary6 months
  • Short Story RecallPrimary6 months
NCT06912321Start2024PhaseObservationalConditionsObesity and diabetesParticipants400Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 years
  • Verbal LearningPrimarysame day
  • Digit Span TestPrimarysame day
  • Symbol CodingPrimarysame day
  • Category FluencyPrimarysame day
  • Complex Figure Copy and RecallPrimarysame day
NCT06869941Start2025PhaseObservationalConditionsObesity and diabetesParticipants100Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary3 years
  • Stroop Color-Word TestSecondary3 years
  • Verbal LearningSecondary3 years
  • Verbal FluencySecondary3 years
  • Complex Figure Copy and RecallSecondary3 years
NCT06867198Start2025PhaseNot applicableConditionsObesity and diabetes, Cardiovascular diseaseParticipants72Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Vocabulary TestSecondary6 months
  • Face-name Memory TaskSecondary6 months
NCT06857994Start2025PhaseObservationalConditionsObesity and diabetes, Cardiovascular diseaseParticipants101Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary
  • Verbal LearningPrimary
  • Verbal FluencyPrimary
  • Digit Span TestPrimary
  • Symbol CodingPrimary
  • N-Back TaskSecondary
  • Letter-Number Sequencing TaskPrimary
NCT06781762Start2025PhaseObservationalConditionsCancer, Obesity and diabetesParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestOther outcome6 months
  • Verbal LearningOther outcome6 months
  • Verbal FluencyOther outcome6 months
NCT06735651Start2024PhaseNot applicableConditionsObesity and diabetesParticipants30Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary6 weeks
  • Verbal FluencySecondary6 weeks
  • Digit Span TestSecondary6 weeks
  • Vocabulary TestSecondarysame day
  • Face-name Memory TaskSecondary6 months
NCT06735599Start2024PhaseNot applicableConditionsObesity and diabetes, Cardiovascular diseaseParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary8 weeks
  • Verbal FluencySecondary8 weeks
  • Digit Span TestSecondary8 weeks
  • Face-name Memory TaskSecondary8 weeks
NCT06734546Start2024PhaseNot applicableConditionsDementia and Alzheimer's, Obesity and diabetesParticipants75Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal LearningSecondary6 months
NCT06524388Start2024PhaseNot applicableConditionsAging, frailty and exercise, Obesity and diabetesParticipants120Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Verbal LearningSecondary6 months
  • Symbol CodingSecondary6 months
  • Picture Naming TestSecondary6 months
NCT06496412Start2024PhaseNot applicableConditionsObesity and diabetesParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary6 months
  • Stroop Color-Word TestPrimary6 months
  • Verbal LearningPrimary6 months
  • Verbal FluencyPrimary6 months
  • Symbol CodingPrimary6 months
  • Picture Naming TestPrimary6 months
  • Task Switching TestPrimary6 months
  • Clock Drawing TaskPrimary6 months
NCT06243172Start2024PhaseObservationalConditionsObesity and diabetes, Sleep and sleep disordersParticipants60Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestSecondarysame day
  • Verbal LearningSecondarysame day
  • Verbal FluencySecondarysame day
  • Symbol CodingSecondarysame day
  • Letter-Number Sequencing TaskSecondarysame day
NCT06069739Start2016PhaseNot applicableConditionsObesity and diabetesParticipants29Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary4 months
  • Stroop Color-Word TestPrimary4 months
  • Verbal LearningPrimary4 months
  • Verbal FluencyPrimary4 months
  • Category FluencyPrimary4 months
  • Card Sorting Test (Berg)Primary4 months
  • Complex Figure Copy and RecallPrimary4 months
NCT05997316Start2023PhaseNot applicableConditionsMild cognitive impairment, Obesity and diabetesParticipants33Lead sponsorOtherStatusCompleted

Results

Library tests named
  • Trail Making TestPrimary12 weeks
  • Verbal LearningPrimary12 weeks
  • Verbal FluencyPrimary12 weeks
  • Digit Span TestPrimary12 weeks
  • Symbol CodingPrimary12 weeks
  • Category FluencyPrimary12 weeks
NCT05880095Start2023PhaseNot applicableConditionsAging, frailty and exercise, Obesity and diabetesParticipants176Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestPrimary12 months
  • Verbal LearningPrimary12 months
NCT05835999Start2023PhasePhase 2ConditionsAging, frailty and exercise, Obesity and diabetesParticipants106Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningOther outcome6 months
NCT05709847Start2023PhaseNot applicableConditionsObesity and diabetesParticipants70Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Verbal LearningPrimary8 weeks
  • Digit Span TestSecondarysame day
  • Symbol CodingSecondary8 weeks
  • Corsi Block-Tapping TestSecondary8 weeks

Page 1 of 3

Questions, answered from the data

How many obesity and diabetes trials use Verbal Learning?

74 registered obesity and diabetes studies on ClinicalTrials.gov name it in an outcome measure, 27 of them in a primary outcome: 12% of the condition's 627 studies with a cognitive outcome, against 11% of all of them. It is the 3rd most named test in obesity and diabetes trials.

Which tests do obesity and diabetes trials use with Verbal Learning?

The Trail Making Test (40 studies), Verbal Fluency (31 studies) and the Digit Span Test (30 studies).

When do obesity and diabetes trials measure Verbal Learning?

Half of the primary outcomes that name Verbal Learning are measured within 6 months of the start, and the middle half from 12 weeks to 12 months. 24 primary outcomes give a duration.

How many completed obesity and diabetes trials that use Verbal Learning have reported results?

24 of the 45 completed studies that name it, 53%, have reported results: 12 posted them on ClinicalTrials.gov, 20 have a results paper linked to the registry record, and 8 did both. The other 21 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on Verbal Learning and obesity and diabetes

  • Every cognitive test in obesity and diabetes trials: 627 studies
  • Verbal Learning in all clinical trials: 1,832 studies

Verbal Learning in other conditions

  • Cancer235
  • Dementia and Alzheimer's224
  • Mild cognitive impairment183
  • Depression and bipolar disorder178
  • Multiple sclerosis139
  • Aging, frailty and exercise128
  • Schizophrenia and psychosis112
  • Brain injury and concussion111
  • Cognitive impairment and decline79
  • Substance use and addiction77
  • Pain and fatigue72
  • Anxiety, PTSD and OCD70
  • Sleep and sleep disorders66
  • Cardiovascular disease64
  • Stroke63
  • Parkinson's disease61
  • Healthy volunteers56
  • Delirium, surgery and intensive care51

Other tests in obesity and diabetes trials

  • Stroop Color-Word Test103
  • Trail Making Test102
  • Digit Span Test64
  • Verbal Fluency63
  • Symbol Coding59

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.

The census counts Verbal Learning and Grocery Trip Game as one test family, so this page counts their studies together.

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