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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. /Mild cognitive impairment
  6. /Verbal Learning

Clinical trials data

Verbal Learning in mild cognitive impairment trials: 183 registered studies

Every registered mild cognitive impairment 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 mild cognitive impairment studies name it in an outcome measure
183
Name it in a primary outcome, 55%
101 of 183
Of the condition's 859 studies name it, against 11% of all registered studies
21%
Other conditions
Median participants per study
69
By phase
Try Verbal LearningTry the Grocery Trip Game

Tests named in the same studies

The library tests that mild cognitive impairment studies naming Verbal Learning name most often beside it.
  1. 1

    Trail Making Test84 studies, 36 as a primary outcome

  2. 2

    Verbal Fluency69 studies, 25 as a primary outcome

  3. 3

    Digit Span Test59 studies, 27 as a primary outcome

  4. 4

    Picture Naming Test45 studies, 14 as a primary outcome

  5. 5

    Category Fluency36 studies, 19 as a primary outcome

  6. 6

    Stroop Color-Word Test35 studies, 9 as a primary outcome

  7. 7

    Symbol Coding28 studies, 13 as a primary outcome

  8. 8

    Short Story Recall22 studies, 13 as a primary outcome

  9. 9

    Complex Figure Copy and Recall20 studies, 9 as a primary outcome

  10. 10

    Clock Drawing Task15 studies, 7 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: 1 studies, 1 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: 2 studies, 2 with a test as a primary outcome2009: 1 studies, 1 with a test as a primary outcome2010: 4 studies, 4 with a test as a primary outcome20102011: 6 studies, 3 with a test as a primary outcome2012: 8 studies, 4 with a test as a primary outcome2013: 5 studies, 3 with a test as a primary outcome2014: 2 studies, 1 with a test as a primary outcome2015: 7 studies, 6 with a test as a primary outcome20152016: 11 studies, 7 with a test as a primary outcome2017: 6 studies, 4 with a test as a primary outcome2018: 11 studies, 9 with a test as a primary outcome2019: 18 studies, 11 with a test as a primary outcome2020: 10 studies, 4 with a test as a primary outcome20202021: 12 studies, 8 with a test as a primary outcome2022: 11 studies, 3 with a test as a primary outcome2023: 22 studies, 12 with a test as a primary outcome2024: 18 studies, 8 with a test as a primary outcome2025: 11 studies, 3 with a test as a primary outcome20252026: 16 studies, 7 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
200311
200400
200500
200600
200700
200822
200911
201044
201163
201284
201353
201421
201576
2016117
201764
2018119
20191811
2020104
2021128
2022113
20232212
2024188
2025113
2026167

Phases and study sizes

By phase

  • Early phase 14 studies, 2 as a primary outcome
  • Phase 12 studies, 2 as a primary outcome
  • Phase 1/24 studies, 2 as a primary outcome
  • Phase 216 studies, 10 as a primary outcome
  • Phase 34 studies, 3 as a primary outcome
  • Phase 44 studies, 3 as a primary outcome
  • Not applicable124 studies, 70 as a primary outcome
  • Observational25 studies, 9 as a primary outcome

Participants per study

102050100200500
  • Phase 277 median, 43 to 148
  • Not applicable60 median, 31 to 113
  • Observational200 median, 100 to 600
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 mild cognitive impairment study that names Verbal Learning, by phase
PhaseStudies with a sizeMedianMiddle half
Phase 2157743 to 148
Not applicable1236031 to 113
Observational25200100 to 600

When mild cognitive impairment trials measure it

Half of the primary outcomes that name Verbal Learning are measured within 4 months of the start, and the middle half from 9 weeks to 6 months. 95 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day12 outcomes, 6 as a primary outcome
  • Up to 4 weeks15 outcomes, 10 as a primary outcome
  • 1 to 3 months45 outcomes, 29 as a primary outcome
  • 3 to 6 months38 outcomes, 26 as a primary outcome
  • 6 to 12 months32 outcomes, 11 as a primary outcome
  • 1 to 2 years14 outcomes, 8 as a primary outcome
  • Over 2 years15 outcomes, 5 as a primary outcome
  • No duration given12 outcomes, 6 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

171 of the 183 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting40 studies, 20 as a primary outcome
  • Not yet recruiting11 studies, 3 as a primary outcome
  • Active, not recruiting3 studies, 1 as a primary outcome
  • Completed87 studies, 52 as a primary outcome
  • Stopped early10 studies, 7 as a primary outcome
  • Status unknown32 studies, 18 as a primary outcome

What they test

  • Behavioral74 studies, 42 as a primary outcome
  • Drug22 studies, 11 as a primary outcome
  • Device46 studies, 29 as a primary outcome
  • Dietary supplement11 studies, 6 as a primary outcome
  • Procedure1 studies, 0 as a primary outcome
  • Diagnostic test3 studies, 1 as a primary outcome
  • Biological4 studies, 2 as a primary outcome
  • Radiation2 studies, 1 as a primary outcome
  • Combination product3 studies, 2 as a primary outcome
  • Other43 studies, 25 as a primary outcome
  • None given12 studies, 3 as a primary outcome

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

Where their sites are

  • United States79 studies, 48 as a primary outcome
  • Canada16 studies, 6 as a primary outcome
  • China15 studies, 5 as a primary outcome
  • Italy10 studies, 4 as a primary outcome
  • Germany5 studies, 1 as a primary outcome
  • Greece5 studies, 5 as a primary outcome
  • Singapore5 studies, 3 as a primary outcome
  • Spain5 studies, 3 as a primary outcome
  • Switzerland5 studies, 2 as a primary outcome
  • United Kingdom5 studies, 2 as a primary outcome
  • Netherlands4 studies, 3 as a primary outcome
  • South Korea4 studies, 2 as a primary outcome

26 countries in all. A study with sites in several counts in each; 17 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 mild cognitive impairment studies that name Verbal Learning: 46 of 87, 53%

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

Completed mild cognitive impairment studies that name Verbal Learning and every completed study, by how they reported results
ResultsCompleted mild cognitive impairment studies that name Verbal LearningEvery completed study
Results on ClinicalTrials.gov and a paper16, 18%776, 10%
Results on ClinicalTrials.gov only19, 22%1,139, 14%
A results paper only11, 13%1,711, 22%
Neither41, 47%4,327, 54%

The 183 studies

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

183 studies match. 101 name Verbal Learning in a primary outcome. Median size 69 participants. Median time to the primary outcome: 4 months.

Loading 183 studies; the filters turn on when they arrive.

By start year
01020302000: 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: 1 studies, 1 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: 2 studies, 2 naming Verbal Learning in a primary outcome2009: 1 studies, 1 naming Verbal Learning in a primary outcome2010: 4 studies, 4 naming Verbal Learning in a primary outcome20102011: 6 studies, 3 naming Verbal Learning in a primary outcome2012: 8 studies, 4 naming Verbal Learning in a primary outcome2013: 5 studies, 3 naming Verbal Learning in a primary outcome2014: 2 studies, 1 naming Verbal Learning in a primary outcome2015: 7 studies, 6 naming Verbal Learning in a primary outcome20152016: 11 studies, 7 naming Verbal Learning in a primary outcome2017: 6 studies, 4 naming Verbal Learning in a primary outcome2018: 11 studies, 9 naming Verbal Learning in a primary outcome2019: 18 studies, 11 naming Verbal Learning in a primary outcome2020: 10 studies, 4 naming Verbal Learning in a primary outcome20202021: 12 studies, 8 naming Verbal Learning in a primary outcome2022: 11 studies, 3 naming Verbal Learning in a primary outcome2023: 22 studies, 12 naming Verbal Learning in a primary outcome2024: 18 studies, 8 naming Verbal Learning in a primary outcome2025: 11 studies, 3 naming Verbal Learning in a primary outcome20252026: 16 studies, 7 naming Verbal Learning 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
200311
200400
200500
200600
200700
200822
200911
201044
201163
201284
201353
201421
201576
2016117
201764
2018119
20191811
2020104
2021128
2022113
20232212
2024188
2025113
2026167

Library tests named most

  • Verbal Learning183 studies, 101 as a primary outcome
  • Trail Making Test84 studies, 36 as a primary outcome
  • Verbal Fluency69 studies, 25 as a primary outcome
  • Digit Span Test59 studies, 27 as a primary outcome
  • Picture Naming Test45 studies, 14 as a primary outcome
  • Category Fluency36 studies, 19 as a primary outcome
  • Stroop Color-Word Test35 studies, 9 as a primary outcome
  • Symbol Coding28 studies, 13 as a primary outcome
  • Short Story Recall22 studies, 13 as a primary outcome
  • Complex Figure Copy and Recall20 studies, 9 as a primary outcome

Largest condition groups

  • Mild cognitive impairment183 studies, 101 as a primary outcome
  • Dementia and Alzheimer's72 studies, 39 as a primary outcome
  • Aging, frailty and exercise17 studies, 10 as a primary outcome
  • Parkinson's disease7 studies, 4 as a primary outcome
  • Sleep and sleep disorders7 studies, 6 as a primary outcome
  • Depression and bipolar disorder6 studies, 1 as a primary outcome
  • Obesity and diabetes6 studies, 5 as a primary outcome
  • Healthy volunteers5 studies, 4 as a primary outcome
  • Brain injury and concussion3 studies, 2 as a primary outcome
  • Substance use and addiction3 studies, 2 as a primary outcome
  • Cardiovascular disease3 studies, 1 as a primary outcome
  • Stroke1 study, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 14, other 169. Interventional 158, observational 25.

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
NCT07885085Start2027PhaseObservationalConditionsMild cognitive impairment, Substance use and addiction, Delirium, surgery and intensive care, Pain and fatigueParticipants552Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningOther outcome6 months
NCT07883148Start2024PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants52Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary8 months
  • Verbal LearningSecondary8 months
  • Verbal FluencySecondary8 months
  • Digit Span TestSecondary8 months
  • Complex Figure Copy and RecallSecondary8 months
NCT07799584Start2026PhaseNot applicableConditionsMild cognitive impairmentParticipants120Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningPrimary6 months
  • Digit Span TestPrimary8 weeks
  • N-Back TaskPrimary8 weeks
  • Go/No-Go TaskPrimary8 weeks
  • Mnemonic Similarity TaskPrimary6 months
NCT07731334Start2026PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants384Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary12 months
  • Stroop Color-Word TestSecondary12 months
  • Verbal LearningSecondary12 months
  • Verbal FluencySecondary12 months
  • Digit Span TestSecondary12 months
  • Complex Figure Copy and RecallSecondary12 months
  • Corsi Block-Tapping TestSecondary12 months
  • Oddball Target DetectionSecondary
NCT07688382Start2026PhaseNot applicableConditionsMild cognitive impairmentParticipants70Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningPrimary12 weeks
  • Picture Naming TestSecondary12 weeks
NCT07672977Start2025PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants30Lead sponsorIndustryStatusRecruitingLibrary tests named
  • Verbal LearningOther outcome7 months
  • Digit Span TestOther outcome7 months
  • Short Story RecallOther outcome7 months
  • Symbol Scan TaskOther outcome7 months
  • Word Pair LearningOther outcome7 months
NCT07667478Start2026PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary6 months
  • Verbal LearningPrimary6 months
  • Digit Span TestPrimary6 months
  • Picture Naming TestPrimary6 months
NCT07652775Start2026PhaseNot applicableConditionsMild cognitive impairment, Depression and bipolar disorderParticipants45Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary5 weeks
  • Stroop Color-Word TestSecondary5 weeks
  • Verbal LearningSecondary5 weeks
  • Digit Span TestSecondary5 weeks
NCT07651085Start2024PhaseObservationalConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's disease, Sleep and sleep disordersParticipants65Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Verbal LearningPrimary
  • Verbal FluencyPrimary
  • Category FluencyPrimary
  • Clock Drawing TaskPrimary
NCT07629349Start2020PhaseObservationalConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants600Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary6 months
  • Verbal LearningPrimary6 months
  • Digit Span TestPrimary6 months
  • Complex Figure Copy and RecallPrimary6 months
  • Matrix ReasoningPrimary6 months
  • Block Copy TestPrimary6 months
NCT07611396Start2026PhaseObservationalConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants160Lead sponsorIndustryStatusRecruitingLibrary tests named
  • Verbal LearningSecondary18 months
NCT07608510Start2026PhaseObservationalConditionsMild cognitive impairmentParticipants150Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary
  • Verbal LearningSecondary
  • Verbal FluencySecondary
  • Picture Naming TestSecondary
NCT07596940Start2023PhaseNot applicableConditionsMild cognitive impairmentParticipants9Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningPrimary4 weeks
  • Verbal FluencyPrimary4 weeks
NCT07533084Start2026PhaseObservationalConditionsDementia and Alzheimer's, Mild cognitive impairment, Aging, frailty and exerciseParticipants265Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary
  • Verbal LearningSecondary
  • Short Story RecallSecondary
NCT07517380Start2026PhaseNot applicableConditionsMild cognitive impairmentParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary6 months
  • Stroop Color-Word TestPrimary6 months
  • Verbal LearningPrimary6 months
  • Verbal FluencyPrimary6 months
  • Digit Span TestPrimary6 months
  • Picture Naming TestPrimary6 months
  • Complex Figure Copy and RecallPrimary6 months
  • Matrix ReasoningPrimary6 months
  • Corsi Block-Tapping TestPrimary6 months
NCT07512193Start2026PhaseNot applicableConditionsMild cognitive impairmentParticipants10Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary4 weeks
  • Verbal LearningPrimary4 weeks
  • Verbal FluencySecondary4 weeks
  • Digit Span TestSecondary4 weeks
  • Picture Naming TestSecondary4 weeks
  • Mnemonic Similarity TaskSecondary4 weeks
NCT07402356Start2025PhaseObservationalConditionsDementia and Alzheimer's, Mild cognitive impairment, Depression and bipolar disorderParticipants140Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Verbal LearningSecondary6 months
  • Verbal FluencySecondary6 months
  • N-Back TaskPrimarysame day
  • Category FluencySecondary6 months
  • Picture Naming TestSecondary6 months
NCT07376135Start2026PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants300Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestOther outcome18 months
  • Stroop Color-Word TestOther outcome18 months
  • Verbal LearningOther outcome18 months
  • Digit Span TestOther outcome18 months
  • Symbol CodingOther outcome18 months
  • Short Story RecallOther outcome18 months
  • Complex Figure Copy and RecallOther outcome18 months
NCT07366346Start2026PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants100Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary5 months
  • Verbal LearningPrimary5 months
  • Verbal FluencyPrimary5 months
  • Category FluencyPrimary5 months
NCT07353359Start2026PhaseNot applicableConditionsMild cognitive impairmentParticipants65Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal LearningSecondary6 months
NCT07321821Start2025PhaseNot applicableConditionsMild cognitive impairmentParticipants60Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Stroop Color-Word TestSecondary9 weeks
  • Verbal LearningSecondary9 weeks
  • Verbal FluencySecondary9 weeks
  • Digit Span TestSecondary9 weeks
  • Complex Figure Copy and RecallSecondary9 weeks
NCT07298876Start2026PhaseNot applicableConditionsMild cognitive impairment, Aging, frailty and exercise, Sleep and sleep disordersParticipants20Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningPrimary10 weeks
NCT07214974Start2026PhaseEarly phase 1ConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's diseaseParticipants600Lead sponsorIndustryStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary5 years
  • Verbal LearningSecondary5 years
  • Picture Naming TestSecondary5 years
NCT07089303Start2025PhaseObservationalConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants750Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary12 months
  • Stroop Color-Word TestSecondary12 months
  • Verbal LearningSecondary12 months
  • Digit Span TestSecondary12 months
  • Symbol CodingSecondary12 months
  • Picture Naming TestSecondary12 months
  • Clock Drawing TaskSecondary12 months
  • Complex Figure Copy and RecallSecondary12 months
NCT07002996Start2025PhaseNot applicableConditionsMild cognitive impairmentParticipants80Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary9 months
  • Verbal LearningSecondary9 months
  • Verbal FluencySecondary9 months
  • Go/No-Go TaskSecondary9 months

Page 1 of 8

Questions, answered from the data

How many mild cognitive impairment trials use Verbal Learning?

183 registered mild cognitive impairment studies on ClinicalTrials.gov name it in an outcome measure, 101 of them in a primary outcome: 21% of the condition's 859 studies with a cognitive outcome, against 11% of all of them. It is the 2nd most named test in mild cognitive impairment trials.

Which tests do mild cognitive impairment trials use with Verbal Learning?

The Trail Making Test (84 studies), Verbal Fluency (69 studies) and the Digit Span Test (59 studies).

How many participants do phase 2 mild cognitive impairment trials that use Verbal Learning enroll?

Half of the phase 2 studies that name it enroll 77 participants or fewer, and the middle half enroll 43 to 148. 15 of them give a size.

When do mild cognitive impairment trials measure Verbal Learning?

Half of the primary outcomes that name Verbal Learning are measured within 4 months of the start, and the middle half from 9 weeks to 6 months. 95 primary outcomes give a duration.

How many completed mild cognitive impairment trials that use Verbal Learning have reported results?

46 of the 87 completed studies that name it, 53%, have reported results: 35 posted them on ClinicalTrials.gov, 27 have a results paper linked to the registry record, and 16 did both. The other 41 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on Verbal Learning and mild cognitive impairment

  • Every cognitive test in mild cognitive impairment trials: 859 studies
  • Verbal Learning in all clinical trials: 1,832 studies

Verbal Learning in other conditions

  • Cancer235
  • Dementia and Alzheimer's224
  • 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
  • Obesity and diabetes74
  • 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 mild cognitive impairment trials

  • Trail Making Test213
  • Verbal Fluency177
  • Digit Span Test169
  • Stroop Color-Word Test126
  • Category Fluency92
  • Symbol Coding84
  • Short Story Recall74
  • Picture Naming Test71

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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