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  1. Home
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  5. /Dementia and Alzheimer's
  6. /Complex Figure Copy and Recall

Clinical trials data

Complex Figure Copy and Recall in dementia and Alzheimer's trials: 53 registered studies

Every registered dementia and Alzheimer's disease study on ClinicalTrials.gov that names Complex Figure Copy and Recall 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 dementia and Alzheimer's disease studies name it in an outcome measure
53
Name it in a primary outcome, 43%
23 of 53
Of the condition's 1,673 studies name it, against 2% of all registered studies
3%
Other conditions
Median participants per study
78
By phase
Try Complex Figure Copy and Recall

Tests named in the same studies

The library tests that dementia and Alzheimer's disease studies naming Complex Figure Copy and Recall name most often beside it.
  1. 1

    Trail Making Test38 studies, 17 as a primary outcome

  2. 2

    Verbal Learning32 studies, 15 as a primary outcome

  3. 3

    Verbal Fluency31 studies, 13 as a primary outcome

  4. 4

    Digit Span Test27 studies, 13 as a primary outcome

  5. 5

    Stroop Color-Word Test18 studies, 11 as a primary outcome

  6. 6

    Picture Naming Test15 studies, 8 as a primary outcome

  7. 7

    Symbol Coding12 studies, 6 as a primary outcome

  8. 8

    Category Fluency11 studies, 6 as a primary outcome

  9. 9

    Clock Drawing Task11 studies, 6 as a primary outcome

  10. 10

    Short Story Recall11 studies, 4 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: 1 studies, 1 with a test as a primary outcome20052006: 0 studies, 0 with a test as a primary outcome2007: 2 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, 0 with a test as a primary outcome2012: 2 studies, 1 with a test as a primary outcome2013: 1 studies, 1 with a test as a primary outcome2014: 0 studies, 0 with a test as a primary outcome2015: 1 studies, 0 with a test as a primary outcome20152016: 1 studies, 0 with a test as a primary outcome2017: 3 studies, 1 with a test as a primary outcome2018: 2 studies, 2 with a test as a primary outcome2019: 4 studies, 3 with a test as a primary outcome2020: 3 studies, 3 with a test as a primary outcome20202021: 2 studies, 2 with a test as a primary outcome2022: 3 studies, 1 with a test as a primary outcome2023: 5 studies, 1 with a test as a primary outcome2024: 9 studies, 3 with a test as a primary outcome2025: 7 studies, 3 with a test as a primary outcome20252026: 3 studies, 0 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
200511
200600
200720
200811
200910
201010
201110
201221
201311
201400
201510
201610
201731
201822
201943
202033
202122
202231
202351
202493
202573
202630

Phases and study sizes

By phase

  • Early phase 11 studies, 0 as a primary outcome
  • Phase 11 studies, 1 as a primary outcome
  • Phase 1/22 studies, 1 as a primary outcome
  • Phase 26 studies, 2 as a primary outcome
  • Phase 31 studies, 0 as a primary outcome
  • Phase 41 studies, 0 as a primary outcome
  • Not applicable27 studies, 10 as a primary outcome
  • Observational14 studies, 9 as a primary outcome

Participants per study

1020501002005001,000
  • Not applicable61 median, 46 to 171
  • Observational310 median, 156 to 750
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 dementia and Alzheimer's disease study that names Complex Figure Copy and Recall, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable276146 to 171
Observational13310156 to 750

When dementia and Alzheimer's trials measure it

Half of the primary outcomes that name Complex Figure Copy and Recall are measured within 6 months of the start, and the middle half from 12 weeks to 12 months. 21 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day5 outcomes, 4 as a primary outcome
  • Up to 4 weeks4 outcomes, 0 as a primary outcome
  • 1 to 3 months5 outcomes, 3 as a primary outcome
  • 3 to 6 months12 outcomes, 6 as a primary outcome
  • 6 to 12 months15 outcomes, 4 as a primary outcome
  • 1 to 2 years2 outcomes, 0 as a primary outcome
  • Over 2 years7 outcomes, 4 as a primary outcome
  • No duration given3 outcomes, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

50 of the 53 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting11 studies, 3 as a primary outcome
  • Not yet recruiting4 studies, 2 as a primary outcome
  • Completed25 studies, 11 as a primary outcome
  • Stopped early3 studies, 2 as a primary outcome
  • Status unknown10 studies, 5 as a primary outcome

What they test

  • Behavioral15 studies, 8 as a primary outcome
  • Drug11 studies, 3 as a primary outcome
  • Device11 studies, 4 as a primary outcome
  • Dietary supplement1 studies, 0 as a primary outcome
  • Procedure1 studies, 0 as a primary outcome
  • Diagnostic test2 studies, 1 as a primary outcome
  • Other10 studies, 1 as a primary outcome
  • None given9 studies, 6 as a primary outcome

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

Where their sites are

  • Italy13 studies, 5 as a primary outcome
  • China10 studies, 5 as a primary outcome
  • United States10 studies, 7 as a primary outcome
  • Canada3 studies, 1 as a primary outcome
  • Taiwan3 studies, 1 as a primary outcome
  • France2 studies, 0 as a primary outcome
  • Spain2 studies, 1 as a primary outcome
  • Sweden2 studies, 1 as a primary outcome
  • Austria1 studies, 0 as a primary outcome
  • Belgium1 studies, 0 as a primary outcome
  • Brazil1 studies, 0 as a primary outcome
  • Bulgaria1 studies, 0 as a primary outcome

24 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 dementia and Alzheimer's disease studies that name Complex Figure Copy and Recall: 16 of 25, 64%

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

Completed dementia and Alzheimer's disease studies that name Complex Figure Copy and Recall and every completed study, by how they reported results
ResultsCompleted dementia and Alzheimer's disease studies that name Complex Figure Copy and RecallEvery completed study
Results on ClinicalTrials.gov and a paper6, 24%776, 10%
Results on ClinicalTrials.gov only3, 12%1,139, 14%
A results paper only7, 28%1,711, 22%
Neither9, 36%4,327, 54%

The 53 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionDementia and Alzheimer's
TestComplex Figure Copy and Recall

53 studies match. 23 name Complex Figure Copy and Recall in a primary outcome. Median size 78 participants. Median time to the primary outcome: 6 months.

Loading 53 studies; the filters turn on when they arrive.

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

2026 is partly planned starts.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200100
200200
200300
200400
200511
200600
200720
200811
200910
201010
201110
201221
201311
201400
201510
201610
201731
201822
201943
202033
202122
202231
202351
202493
202573
202630

Library tests named most

  • Complex Figure Copy and Recall53 studies, 23 as a primary outcome
  • Trail Making Test38 studies, 17 as a primary outcome
  • Verbal Learning32 studies, 15 as a primary outcome
  • Verbal Fluency31 studies, 13 as a primary outcome
  • Digit Span Test27 studies, 13 as a primary outcome
  • Stroop Color-Word Test18 studies, 11 as a primary outcome
  • Picture Naming Test15 studies, 8 as a primary outcome
  • Symbol Coding12 studies, 6 as a primary outcome
  • Category Fluency11 studies, 6 as a primary outcome
  • Clock Drawing Task11 studies, 6 as a primary outcome

Conditions

  • Dementia and Alzheimer's53 studies, 23 as a primary outcome
  • Mild cognitive impairment15 studies, 5 as a primary outcome
  • Aging, frailty and exercise4 studies, 2 as a primary outcome
  • Parkinson's disease3 studies, 2 as a primary outcome
  • Healthy volunteers2 studies, 2 as a primary outcome
  • Schizophrenia and psychosis1 study, 0 as a primary outcome
  • Depression and bipolar disorder1 study, 1 as a primary outcome
  • Obesity and diabetes1 study, 1 as a primary outcome
  • Hearing loss1 study, 0 as a primary outcome
  • Cardiovascular disease1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 2, other 51. Interventional 39, observational 14.

As a primary outcomeSecondary or other outcomeComplex Figure Copy and Recall

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
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
NCT07882251Start2021PhaseNot applicableConditionsDementia and Alzheimer'sParticipants80Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestPrimary5 weeks
  • Verbal LearningPrimary5 weeks
  • Digit Span TestPrimary5 weeks
  • Category FluencyPrimary5 weeks
  • Complex Figure Copy and RecallPrimary5 weeks
  • Corsi Block-Tapping TestPrimary5 weeks
  • Line Angle MatchingPrimary5 weeks
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
NCT07664865Start2024PhaseObservationalConditionsDementia and Alzheimer'sParticipants250Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestPrimarysame day
  • Verbal FluencyPrimarysame day
  • Symbol CodingPrimarysame day
  • Picture Naming TestPrimarysame day
  • Clock Drawing TaskPrimarysame day
  • Complex Figure Copy and RecallPrimarysame day
  • Emoji Emotion RecognitionPrimarysame day
  • Selective Reminding TaskPrimarysame day
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
NCT07399418Start2025PhaseObservationalConditionsDementia and Alzheimer'sParticipants80Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimarysame day
  • Stroop Color-Word TestPrimarysame day
  • Verbal FluencyPrimarysame day
  • Digit Span TestPrimarysame day
  • Go/No-Go TaskPrimarysame day
  • Category FluencyPrimarysame day
  • Clock Drawing TaskPrimarysame day
  • Complex Figure Copy and RecallPrimarysame day
  • Matrix ReasoningPrimarysame day
  • Selective Reminding TaskPrimarysame day
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
NCT07375771Start2025PhaseNot applicableConditionsDementia and Alzheimer'sParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary12 weeks
  • Verbal LearningPrimary12 weeks
  • Verbal FluencyPrimary12 weeks
  • Digit Span TestPrimary12 weeks
  • Category FluencyPrimary12 weeks
  • Task Switching TestPrimary12 weeks
  • Clock Drawing TaskPrimary12 weeks
  • Complex Figure Copy and RecallPrimary12 weeks
  • Visual Search TestPrimary12 weeks
NCT07135245Start2026PhasePhase 2ConditionsDementia and Alzheimer'sParticipants180Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Symbol CodingSecondary18 months
  • Complex Figure Copy and RecallSecondary18 months
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
NCT07087951Start2025PhaseNot applicableConditionsDementia and Alzheimer'sParticipants70Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Verbal LearningSecondary13 weeks
  • Verbal FluencySecondary13 weeks
  • Digit Span TestSecondary13 weeks
  • Short Story RecallSecondary13 weeks
  • Complex Figure Copy and RecallSecondary13 weeks
NCT06902753Start2025PhaseNot applicableConditionsDementia and Alzheimer's, Hearing lossParticipants120Lead sponsorOtherStatusStopped earlyLibrary tests named
  • Complex Figure Copy and RecallSecondary
  • Matrix ReasoningSecondary
  • Symbol Scan TaskSecondary
NCT06875739Start2025PhaseObservationalConditionsDementia and Alzheimer's, Parkinson's diseaseParticipants310Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestPrimarysame day
  • Stroop Color-Word TestPrimarysame day
  • Complex Figure Copy and RecallPrimarysame day
NCT06869135Start2025PhaseObservationalConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's diseaseParticipants242Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary12 months
  • Stroop Color-Word TestSecondary12 months
  • Complex Figure Copy and RecallSecondary12 months
NCT06733714Start2024PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary1 week
  • Verbal FluencySecondary1 week
  • Category FluencySecondary1 week
  • Complex Figure Copy and RecallSecondary1 week
  • Oddball Target DetectionSecondary1 week
  • Antisaccade TaskSecondary1 week
  • Visual Search TestSecondary1 week
NCT06715995Start2024PhaseNot applicableConditionsDementia and Alzheimer's, Aging, frailty and exerciseParticipants52Lead sponsorOtherStatusRecruiting

Paper

Library tests named
  • Trail Making TestSecondary4 weeks
  • Verbal LearningSecondary4 weeks
  • Verbal FluencySecondary4 weeks
  • Short Story RecallSecondary4 weeks
  • Complex Figure Copy and RecallSecondary4 weeks
NCT06694597Start2023PhasePhase 2ConditionsDementia and Alzheimer'sParticipants76Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Complex Figure Copy and RecallSecondary6 months
NCT06215274Start2024PhaseObservationalConditionsDementia and Alzheimer'sParticipants156Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondarysame day
  • Verbal FluencySecondarysame day
  • Picture Naming TestSecondarysame day
  • Complex Figure Copy and RecallSecondarysame day
NCT06181513Start2022PhaseEarly phase 1ConditionsDementia and Alzheimer'sParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Complex Figure Copy and RecallSecondary16 weeks
NCT06181500Start2023PhaseNot applicableConditionsDementia and Alzheimer'sParticipants13Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Category FluencySecondary6 months
  • Picture Naming TestSecondary6 months
  • Complex Figure Copy and RecallSecondary6 months
  • Picture Matching TaskSecondary6 months
  • Spelling to Dictation TaskSecondary6 months
NCT06022068Start2023PhasePhase 1/2ConditionsDementia and Alzheimer'sParticipants14Lead sponsorOtherStatusCompleted

Paper

Library tests named
  • Trail Making TestOther outcome6 months
  • Verbal LearningOther outcome6 months
  • Complex Figure Copy and RecallOther outcome6 months
NCT05887674Start2023PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants180Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestSecondary12 months
  • Verbal LearningPrimary12 months
  • Symbol CodingSecondary12 months
  • Picture Naming TestSecondary12 months
  • Clock Drawing TaskSecondary12 months
  • Complex Figure Copy and RecallPrimary12 months
NCT05730023Start2023PhaseNot applicableConditionsDementia and Alzheimer'sParticipants60Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Stroop Color-Word TestSecondary13 weeks
  • Verbal FluencySecondary13 weeks
  • Picture Naming TestPrimary13 weeks
  • Short Story RecallSecondary13 weeks
  • Complex Figure Copy and RecallSecondary13 weeks
NCT05647473Start2024PhasePhase 2ConditionsDementia and Alzheimer's, Cardiovascular diseaseParticipants66Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestSecondary11 months
  • Verbal FluencySecondary11 months
  • Digit Span TestSecondary11 months
  • Clock Drawing TaskSecondary11 months
  • Complex Figure Copy and RecallSecondary11 months
NCT05623124Start2021PhaseObservationalConditionsDementia and Alzheimer'sParticipants400Lead sponsorOtherStatusStatus unknown

Paper

Library tests named
  • Trail Making TestPrimary
  • Verbal LearningPrimary
  • Symbol CodingPrimary
  • Picture Naming TestPrimary
  • Clock Drawing TaskPrimary
  • Complex Figure Copy and RecallPrimary

Page 1 of 3

Questions, answered from the data

How many dementia and Alzheimer's trials use Complex Figure Copy and Recall?

53 registered dementia and Alzheimer's disease studies on ClinicalTrials.gov name it in an outcome measure, 23 of them in a primary outcome: 3% of the condition's 1,673 studies with a cognitive outcome, against 2% of all of them. It is the 13th most named test in dementia and Alzheimer's trials.

Which tests do dementia and Alzheimer's trials use with Complex Figure Copy and Recall?

The Trail Making Test (38 studies), Verbal Learning (32 studies) and Verbal Fluency (31 studies).

When do dementia and Alzheimer's trials measure Complex Figure Copy and Recall?

Half of the primary outcomes that name Complex Figure Copy and Recall are measured within 6 months of the start, and the middle half from 12 weeks to 12 months. 21 primary outcomes give a duration.

How many completed dementia and Alzheimer's trials that use Complex Figure Copy and Recall have reported results?

16 of the 25 completed studies that name it, 64%, have reported results: 9 posted them on ClinicalTrials.gov, 13 have a results paper linked to the registry record, and 6 did both. The other 9 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on Complex Figure Copy and Recall and dementia and Alzheimer's disease

  • Every cognitive test in dementia and Alzheimer's trials: 1,673 studies
  • Complex Figure Copy and Recall in all clinical trials: 276 studies

Other tests in dementia and Alzheimer's trials

  • Trail Making Test273
  • Verbal Fluency248
  • Verbal Learning224
  • Digit Span Test181
  • Category Fluency167
  • Symbol Coding117
  • Stroop Color-Word Test116
  • Picture Naming Test104
  • Short Story Recall91
  • Selective Reminding Task76
  • Delayed Recall Module71
  • Clock Drawing Task69

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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