ConductCognition

  • Domains

    Tests

    • Processing speed43
    • Attention113
    • Working memory50
    • Executive function143
    • Episodic memory72
    • Response inhibition9
    • Social cognition75
    • Language42

    Most used

    Evidence

    1. Verbal Fluency TestGradeA
    2. Stroop Color-Word TestGradeA
    3. Trail Making TestGradeA
    4. N-Back TaskGradeA
    5. Go/No-Go TaskGradeA
    6. Digit Span TestGradeA
    7. Symbol Coding TestGradeA
    8. Verbal Learning TestGradeA
    REDTry it nowStroop Color-Word Test
    All 547 tests

    Browse by

    • Phone290
    • Tablet323
    • Untimed326
    • Up to 5 minutes69
    • Evidence grade A40

  • First studies

    Grade, length

    • Reaction Time StudyGradeA7 min
    • Pilot ScreeningGradeA15 min
    • Medication StudiesGradeA−26 min
    • Language-Minimized ScreeningGradeA−30 min

    Age groups

    • Older Adult Executive SpeedGradeA20 min
    • School-AgeGradeA−33 min

    Memory

    • At-Home MemoryGradeA26 min
    • Working Memory and LearningGradeA−19 min
    • Associative MemoryGradeB32 min
    • Working Memory CapacityGradeB34 min

    Language and perception

    • LanguageGradeA−33 min
    • Visual PerceptionGradeB27 min
    • Listening and Auditory ProcessingGradeB31 min

    Executive function and attention

    • Executive ControlGradeA18 min
    • Attention and ImpulsivityGradeA−26 min
    • Visual AttentionGradeB27 min
    • Creativity and Flexible ThinkingGradeB30 min
    • Reasoning and SpatialGradeB32 min

    Movement

    • Motor and AttentionGradeA−29 min
    • Motor LearningGradeB34 min

    Behavior, mood and choice

    • Food Choice and Self-ControlGradeA−29 min
    • Sleep and FatigueGradeB23 min
    • Social CognitionGradeB23 min
    • Impulsivity and Substance UseGradeB26 min
    • Emotion and MoodGradeB28 min
    • Decisions and RewardGradeB29 min
    All 26 batteries

    Find one

    Up to 15 minutes2Up to 30 minutes19Phone8
    Test order labBattery gradesHow batteries work

  • Use and evidence

    • Overview
    • Compare all 547 tests
    • Test-retest
    • Reliability and validity
    • Battery grades26
    • Download and cite

    Clinical trials

    • Overview
    • By condition25
    • By test101
    • Trial design benchmark
    • Cognitive outcomes, 2026

    Conditions

    Registered studies

    • Dementia and Alzheimer's1,673
    • Aging, frailty and exercise1,398
    • Depression and bipolar disorder1,247
    • Stroke1,233
    • Substance use and addiction895
    • Parkinson's disease892
    • Cancer760
    All 25 conditions
    16,361Registered studies name a cognitive test in an outcome measure11,688 name a test you can run hereExplore the studies
  • 1

    Build

    • Study design
    • Customize tests
    • Repeat visits
    • Study cost calculator
    2

    Recruit

    • Recruitment setup
    • Prolific
    • Sona Systems
    • CloudResearch Connect
    • Qualtrics
    3

    Run

    • Remote testing
    • Participant devices
    • Phone timing check
    • Offline edition
    4

    Results

    • Automated scoring
    • Test norms
    • Study Quality Monitor
    • Data export
    Platform overview

    Compliance

    • HIPAA-ready testing
    • US clinical research
    • Data Policy
    • Privacy Policy
    • Terms of Use

  • Research areas

    Tests used in each

    • Aging and dementia188
    • Decisions and reward105
    • Child development and education87
    • Language and bilingualism64
    • Social behavior62
    • Psychiatric groups35
    • Training and intervention28
    • Mood, anxiety and trauma25
    • Substance use and impulsivity25
    • Neurological and movement research19
    • Brain injury and concussion14
    • Sleep and fatigue14
    • ADHD11
    • Eating and obesity8
    • Medication and drug trials8

    Research settings

    • Student participant pools
    • Teaching a class
    • Clinical trials
    • US clinical research
    • Sites without internet
    Planning a study?

  • Methods

    • How evidence grades work
    • How test batteries work
    • How test order works
    Methods and questions

    Help

    • FAQ
    • Recruitment guides
    • Compare platforms

    Updates

    • Blog
    • New tests by email
    Latest post10 November 2026What you can do in ConductCognition todayA short tour of ConductCognition as it stands on 10 November. After this, we'll post when something changes how you run a study.Read the post
  • Pricing
Start Free
Log In
Log InStart Free
  1. Home
  2. /Data
  3. /Clinical trials
  4. /Conditions
  5. /Obesity and diabetes

Clinical trials data

Cognitive tests in obesity and diabetes trials: 627 registered studies

Every registered obesity and diabetes study on ClinicalTrials.gov that names a cognitive test in an outcome measure: the tests used most, how often as a primary outcome, which tests go together, how large the studies are and when they measure the outcome.

Registered obesity and diabetes studies name a cognitive test in an outcome
627
Name one in a primary outcome
228
See the tests
Median participants per study
79
By phase
Led by industry
25

The tests obesity and diabetes trials use most

The Stroop Color-Word Test leads: 103 of the 627 studies name it, 16%. Next comes the Trail Making Test (102). As a primary outcome, the Trail Making Test leads with 35 studies.

  1. 1

    Stroop Color-Word Test103 studies, 34 as a primary outcome

  2. 2

    Trail Making Test102 studies, 35 as a primary outcome

  3. 3

    Verbal Learning74 studies, 27 as a primary outcome

  4. 4

    Digit Span Test64 studies, 26 as a primary outcome

  5. 5

    Verbal Fluency63 studies, 30 as a primary outcome

  6. 6

    Symbol Coding59 studies, 27 as a primary outcome

  7. 7

    Go/No-Go Task44 studies, 17 as a primary outcome

  8. 8

    Delay Discounting36 studies, 16 as a primary outcome

  9. 9

    N-Back Task33 studies, 14 as a primary outcome

  10. 10

    Category Fluency27 studies, 15 as a primary outcome

  11. 11

    Eriksen Flanker Task25 studies, 14 as a primary outcome

  12. 12

    Stop-Signal Task24 studies, 4 as a primary outcome

  13. 13

    Matrix Reasoning19 studies, 6 as a primary outcome

  14. 14

    Dimensional Change Card Sort18 studies, 7 as a primary outcome

  15. 15

    Size Order Memory Test17 studies, 6 as a primary outcome

  16. 16

    Short Story Recall16 studies, 7 as a primary outcome

  17. 17

    Psychomotor Vigilance Task16 studies, 2 as a primary outcome

  18. 18

    Continuous Performance Test15 studies, 8 as a primary outcome

  19. 19

    Picture Naming Test14 studies, 5 as a primary outcome

  20. 20

    Task Switching Test13 studies, 6 as a primary outcome

  21. 21

    Choice Reaction Time13 studies, 2 as a primary outcome

  22. 22

    Complex Figure Copy and Recall12 studies, 7 as a primary outcome

  23. 23

    Paired Associate Learning12 studies, 4 as a primary outcome

  24. 24

    Rapid Visual Information Processing12 studies, 4 as a primary outcome

  25. 25

    Clock Drawing Task11 studies, 6 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

26% of obesity and diabetes studies name only instruments outside the library, such as clinician-administered screening scales. They count in every figure on this page and are not listed. The explorer below holds all 100 tests.

Tests used together

The pairs of tests obesity and diabetes studies name together most often.
  1. Stroop Color-Word Test and Trail Making Test42 studies name both
  2. Trail Making Test and Verbal Learning40 studies name both
  3. Trail Making Test and Verbal Fluency34 studies name both
  4. Verbal Fluency and Verbal Learning31 studies name both
  5. Digit Span Test and Verbal Learning30 studies name both
  6. Stroop Color-Word Test and Verbal Learning28 studies name both
  7. Symbol Coding and Trail Making Test26 studies name both
  8. Digit Span Test and Trail Making Test25 studies name both
  9. Symbol Coding and Verbal Learning22 studies name both
  10. Stroop Color-Word Test and Verbal Fluency20 studies name both

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: 2 studies, 0 with a test as a primary outcome2003: 0 studies, 0 with a test as a primary outcome2004: 1 studies, 0 with a test as a primary outcome2005: 1 studies, 1 with a test as a primary outcome20052006: 2 studies, 0 with a test as a primary outcome2007: 5 studies, 1 with a test as a primary outcome2008: 7 studies, 5 with a test as a primary outcome2009: 8 studies, 1 with a test as a primary outcome2010: 9 studies, 2 with a test as a primary outcome20102011: 13 studies, 4 with a test as a primary outcome2012: 10 studies, 3 with a test as a primary outcome2013: 14 studies, 7 with a test as a primary outcome2014: 16 studies, 4 with a test as a primary outcome2015: 31 studies, 9 with a test as a primary outcome20152016: 28 studies, 10 with a test as a primary outcome2017: 26 studies, 10 with a test as a primary outcome2018: 46 studies, 19 with a test as a primary outcome2019: 53 studies, 18 with a test as a primary outcome2020: 27 studies, 9 with a test as a primary outcome20202021: 40 studies, 14 with a test as a primary outcome2022: 55 studies, 23 with a test as a primary outcome2023: 43 studies, 19 with a test as a primary outcome2024: 65 studies, 19 with a test as a primary outcome2025: 64 studies, 29 with a test as a primary outcome20252026: 55 studies, 18 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
200220
200300
200410
200511
200620
200751
200875
200981
201092
2011134
2012103
2013147
2014164
2015319
20162810
20172610
20184619
20195318
2020279
20214014
20225523
20234319
20246519
20256429
20265518

Phases and sponsors

By phase

  • Early phase 18 studies, 3 as a primary outcome
  • Phase 114 studies, 7 as a primary outcome
  • Phase 1/25 studies, 2 as a primary outcome
  • Phase 235 studies, 14 as a primary outcome
  • Phase 2/36 studies, 1 as a primary outcome
  • Phase 312 studies, 3 as a primary outcome
  • Phase 430 studies, 10 as a primary outcome
  • Not applicable397 studies, 132 as a primary outcome
  • Observational120 studies, 56 as a primary outcome

Sponsors and study types

Lead sponsor: industry 25, NIH 9, universities, hospitals and others 593. Interventional 507, observational 120.

Status, results, interventions and countries

Status

  • Recruiting117 studies, 42 as a primary outcome
  • Not yet recruiting43 studies, 15 as a primary outcome
  • Active, not recruiting40 studies, 13 as a primary outcome
  • Completed320 studies, 123 as a primary outcome
  • Stopped early38 studies, 11 as a primary outcome
  • Status unknown69 studies, 24 as a primary outcome

What they test

  • Behavioral210 studies, 77 as a primary outcome
  • Drug115 studies, 40 as a primary outcome
  • Device56 studies, 15 as a primary outcome
  • Dietary supplement61 studies, 22 as a primary outcome
  • Procedure26 studies, 7 as a primary outcome
  • Diagnostic test9 studies, 3 as a primary outcome
  • Biological9 studies, 3 as a primary outcome
  • Radiation1 studies, 0 as a primary outcome
  • Combination product1 studies, 0 as a primary outcome
  • Genetic2 studies, 0 as a primary outcome
  • Other187 studies, 76 as a primary outcome
  • None given64 studies, 29 as a primary outcome

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

Where their sites are

  • United States250 studies, 95 as a primary outcome
  • China45 studies, 16 as a primary outcome
  • Canada32 studies, 6 as a primary outcome
  • United Kingdom29 studies, 8 as a primary outcome
  • Denmark28 studies, 8 as a primary outcome
  • Spain26 studies, 13 as a primary outcome
  • Türkiye24 studies, 10 as a primary outcome
  • Germany22 studies, 3 as a primary outcome
  • Italy20 studies, 5 as a primary outcome
  • France14 studies, 7 as a primary outcome
  • Netherlands14 studies, 1 as a primary outcome
  • Brazil10 studies, 2 as a primary outcome

66 countries in all. A study with sites in several counts in each; 38 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: 161 of 320, 50%

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

Completed obesity and diabetes studies and every completed study, by how they reported results
ResultsCompleted obesity and diabetes studiesEvery completed study
Results on ClinicalTrials.gov and a paper36, 11%776, 10%
Results on ClinicalTrials.gov only35, 11%1,139, 14%
A results paper only90, 28%1,711, 22%
Neither159, 50%4,327, 54%

How many participants they enroll

Enrollment as registered: actual for a finished study, planned for one still recruiting.
1020501002005001,0002,000
  • Phase 141 median, 22 to 60
  • Phase 257 median, 29 to 105
  • Phase 3306 median, 82 to 1,737
  • Phase 4100 median, 60 to 192
  • Not applicable61 median, 37 to 126
  • Observational163 median, 80 to 450
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 by phase
PhaseStudies with a sizeMedianMiddle half
Phase 1134122 to 60
Phase 2345729 to 105
Phase 31230682 to 1,737
Phase 43010060 to 192
Not applicable3906137 to 126
Observational12016380 to 450

When the cognitive outcome is measured

Half of the primary outcomes that name a library test are measured within 13 weeks of the start, and the middle half from 4 weeks to 12 months. 384 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day179 outcomes, 73 as a primary outcome
  • Up to 4 weeks115 outcomes, 34 as a primary outcome
  • 1 to 3 months243 outcomes, 101 as a primary outcome
  • 3 to 6 months210 outcomes, 63 as a primary outcome
  • 6 to 12 months120 outcomes, 57 as a primary outcome
  • 1 to 2 years56 outcomes, 20 as a primary outcome
  • Over 2 years94 outcomes, 36 as a primary outcome
  • No duration given64 outcomes, 30 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

1,017 of the 1,081 outcome measures give a duration. A single visit counts as within a day.

Median time to the primary outcome, by test

Median weeks to the latest time point of each test's primary outcomes
TestPrimary outcomesMedian
Trail Making Test334 months
Stroop Color-Word Test3213 weeks
Verbal Fluency276 months
Symbol Coding2512 weeks
Digit Span Test247 weeks
Verbal Learning246 months
Go/No-Go Task174 weeks
Delay Discounting168 weeks
Category Fluency1512 months
N-Back Task1316 weeks

Explore the obesity and diabetes studies

The 467 obesity and diabetes studies that name a test in the library, with filters for test, phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionObesity and diabetes

467 studies match. 183 name a library test in a primary outcome. Median size 70 participants. Median time to the primary outcome: 13 weeks.

Loading 467 studies; the filters turn on when they arrive.

By start year
02040602000: 0 studies, 0 naming a library test in a primary outcome20002001: 0 studies, 0 naming a library test in a primary outcome2002: 1 studies, 0 naming a library test in a primary outcome2003: 0 studies, 0 naming a library test in a primary outcome2004: 1 studies, 0 naming a library test in a primary outcome2005: 1 studies, 1 naming a library test in a primary outcome20052006: 2 studies, 0 naming a library test in a primary outcome2007: 3 studies, 1 naming a library test in a primary outcome2008: 5 studies, 4 naming a library test in a primary outcome2009: 8 studies, 1 naming a library test in a primary outcome2010: 7 studies, 2 naming a library test in a primary outcome20102011: 10 studies, 4 naming a library test in a primary outcome2012: 8 studies, 2 naming a library test in a primary outcome2013: 13 studies, 7 naming a library test in a primary outcome2014: 14 studies, 4 naming a library test in a primary outcome2015: 24 studies, 8 naming a library test in a primary outcome20152016: 21 studies, 9 naming a library test in a primary outcome2017: 21 studies, 8 naming a library test in a primary outcome2018: 38 studies, 18 naming a library test in a primary outcome2019: 43 studies, 16 naming a library test in a primary outcome2020: 15 studies, 6 naming a library test in a primary outcome20202021: 30 studies, 12 naming a library test in a primary outcome2022: 37 studies, 15 naming a library test in a primary outcome2023: 34 studies, 14 naming a library test in a primary outcome2024: 47 studies, 16 naming a library test in a primary outcome2025: 42 studies, 20 naming a library test in a primary outcome20252026: 37 studies, 12 naming a library test in a primary outcome

2026 is partly planned starts. Not shown: 2 that started before 2000 and 3 planned to start after 2026.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200100
200210
200300
200410
200511
200620
200731
200854
200981
201072
2011104
201282
2013137
2014144
2015248
2016219
2017218
20183818
20194316
2020156
20213012
20223715
20233414
20244716
20254220
20263712

Library tests named most

Largest condition groups

  • Obesity and diabetes467 studies, 183 as a primary outcome
  • Aging, frailty and exercise56 studies, 19 as a primary outcome
  • Cardiovascular disease34 studies, 12 as a primary outcome
  • Dementia and Alzheimer's23 studies, 14 as a primary outcome
  • Sleep and sleep disorders20 studies, 6 as a primary outcome
  • Depression and bipolar disorder16 studies, 6 as a primary outcome
  • Substance use and addiction16 studies, 5 as a primary outcome
  • Mild cognitive impairment15 studies, 11 as a primary outcome
  • Cancer10 studies, 5 as a primary outcome
  • Pain and fatigue7 studies, 2 as a primary outcome
  • Healthy volunteers6 studies, 1 as a primary outcome
  • Delirium, surgery and intensive care6 studies, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 15, NIH 8, other 444. Interventional 389, observational 78.

As a primary outcomeSecondary or other outcome

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
NCT07883031Start2025PhaseNot applicableConditionsObesity and diabetesParticipants25Lead sponsorOtherStatusCompletedLibrary tests named
  • Psychomotor Vigilance TaskPrimary6 weeks
  • Eriksen Flanker TaskPrimary6 weeks
  • Task Switching TestPrimary6 weeks
NCT07872904Start2026PhasePhase 4ConditionsObesity and diabetesParticipants400Lead sponsorOtherStatusRecruitingLibrary tests named
  • Go/No-Go TaskOther outcome13 months
  • Effort for Rewards TaskOther outcome13 months
NCT07870291Start2026PhaseNot applicableConditionsObesity and diabetesParticipants105Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Trail Making TestPrimary12 weeks
  • Symbol CodingPrimary12 weeks
NCT07862452Start2027PhaseNot applicableConditionsObesity and diabetes, Cardiovascular diseaseParticipants400Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Digit Span TestPrimary4 weeks
  • Matrix ReasoningPrimary4 weeks
  • Delay DiscountingPrimary4 weeks
NCT07846865Start2026PhasePhase 2/3ConditionsObesity and diabetes, Sleep and sleep disordersParticipants256Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Psychomotor Vigilance TaskOther outcome12 months
  • Spatial Working MemoryOther outcome12 months
NCT07820774Start2026PhaseNot applicableConditionsObesity and diabetesParticipants54Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary16 weeks
  • Stroop Color-Word TestSecondary16 weeks
NCT07809295Start2026PhaseNot applicableConditionsObesity and diabetesParticipants900Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Food Choice TaskSecondarysame day
NCT07796932Start2027PhaseObservationalConditionsObesity and diabetesParticipants150Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Paired Associate LearningPrimary3 years
NCT07756177Start2023PhaseObservationalConditionsObesity and diabetesParticipants200Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Biological Motion TaskSecondary12 months
NCT07752225Start2026PhaseNot applicableConditionsObesity and diabetesParticipants34Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Eriksen Flanker TaskSecondary7 months
NCT07750223Start2026PhaseNot applicableConditionsObesity and diabetesParticipants105Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary10 weeks
  • Symbol CodingPrimary10 weeks
NCT07732426Start2026PhaseNot applicableConditionsObesity and diabetes, Substance use and addictionParticipants30Lead sponsorOtherStatusRecruitingLibrary tests named
  • Dot-Probe TaskSecondary8 weeks
NCT07714096Start2027PhaseNot applicableConditionsObesity and diabetes, Cardiovascular diseaseParticipants56Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Symbol Scan TaskSecondary12 weeks
NCT07711834Start2025PhaseNot applicableConditionsObesity and diabetesParticipants45Lead sponsorOtherStatusCompletedLibrary tests named
  • Choice Reaction TimeSecondary12 weeks
NCT07705724Start2026PhaseNot applicableConditionsObesity and diabetesParticipants40Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestOther outcomesame day
  • N-Back TaskOther outcomesame day
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
NCT07694596Start2026PhaseNot applicableConditionsObesity and diabetesParticipants200Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Trail Making TestPrimary12 months
  • Verbal FluencyPrimary12 months
  • Digit Span TestPrimary12 months
  • Symbol CodingPrimary12 months
  • Category FluencyPrimary12 months
NCT07688564Start2026PhaseNot applicableConditionsObesity and diabetes, Pain and fatigueParticipants156Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary6 months
  • Letter-Number Sequencing TaskSecondary6 months
NCT07675499Start2026PhasePhase 2/3ConditionsObesity and diabetesParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Size Order Memory TestSecondary16 weeks
  • Pattern and Letter ComparisonSecondary16 weeks
  • Picture Order Memory TestSecondary16 weeks
NCT07650318Start2026PhaseNot applicableConditionsMild cognitive impairment, Obesity and diabetesParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Digit Span TestSecondary6 months
  • Category FluencySecondary6 months
  • Picture Naming TestSecondary6 months
  • Short Story RecallSecondary6 months
  • Delayed Recall ModuleSecondary6 months
NCT07642518Start2026PhaseNot applicableConditionsMild cognitive impairment, Obesity and diabetesParticipants38Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Digit Span TestSecondary6 months
  • Category FluencySecondary6 months
  • Picture Naming TestSecondary6 months
  • Short Story RecallSecondary6 months
NCT07611201Start2025PhaseObservationalConditionsObesity and diabetesParticipants90Lead sponsorOtherStatusCompleted

Paper

Library tests named
  • Stroop Color-Word TestSecondary2 weeks
NCT07600567Start2026PhaseNot applicableConditionsObesity and diabetesParticipants300Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestPrimary6 months
  • Continuous Performance TestPrimary6 months
NCT07592728Start2026PhaseNot applicableConditionsObesity and diabetesParticipants36Lead sponsorOtherStatusRecruitingLibrary tests named
  • Go/No-Go TaskPrimary4 weeks
NCT07592546Start2026PhasePhase 4ConditionsObesity and diabetesParticipants240Lead sponsorOtherStatusRecruitingLibrary tests named
  • Digit Span TestSecondary
  • Matrix ReasoningSecondary
  • Delay DiscountingSecondary
  • Line Angle MatchingSecondary

Page 1 of 19

Questions, answered from the data

Which cognitive test do obesity and diabetes trials use most?

The Stroop Color-Word Test: 103 of the 627 registered studies name it in an outcome measure, 16%. Next come the Trail Making Test (102) and Verbal Learning (74).

Which cognitive test do obesity and diabetes trials use most as a primary outcome?

The Trail Making Test, named in a primary outcome by 35 studies. 228 of the 627 studies, 36%, name a cognitive test in a primary outcome.

How many participants does a phase 2 obesity and diabetes trial enroll?

Half of the phase 2 obesity and diabetes studies enroll 57 participants or fewer, and the middle half enroll 29 to 105. 34 of them give a size.

How long after the start do obesity and diabetes trials measure a cognitive outcome?

Half of the primary outcomes that name a library test are measured within 13 weeks of the start, and the middle half from 4 weeks to 12 months. 384 primary outcomes give a duration.

Which cognitive tests do obesity and diabetes trials use together?

The Stroop Color-Word Test with the Trail Making Test most often: 42 studies name both. Next, the Trail Making Test with Verbal Learning (40).

How many completed obesity and diabetes trials have reported results?

161 of the 320 completed obesity and diabetes studies, 50%, have reported results: 71 posted them on ClinicalTrials.gov, 126 have a results paper linked to the registry record, and 36 did both. The other 159 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

Other conditions

  • Aging, frailty and exercise81 shared
  • Cardiovascular disease61 shared
  • Dementia and Alzheimer's40 shared
  • Mild cognitive impairment37 shared
  • Sleep and sleep disorders23 shared
  • Depression and bipolar disorder18 shared
  • Substance use and addiction16 shared
  • Delirium, surgery and intensive care14 shared
  • Stroke12 shared
  • Cancer12 shared
  • Pain and fatigue10 shared
  • Healthy volunteers9 shared
  • Parkinson's disease6 shared
  • Anxiety, PTSD and OCD5 shared
  • Schizophrenia and psychosis5 shared
  • Hearing loss3 shared
  • Lung disease3 shared
  • COVID-19 and long COVID2 shared
  • Brain injury and concussion1 shared
  • ADHD1 shared
  • Multiple sclerosis612 studies
  • Cognitive impairment and decline354 studies
  • Autism200 studies
  • Epilepsy138 studies

All 16,361 registered studies, by test, condition, phase and year.

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.

Plan the cognitive outcomes of a obesity and diabetes trial

Choose tests with a record in registered trials, and run them in a browser at every site, on the same version each visit.

Start free
ConductCognition

Hosted browser-native cognitive testing for academic and commercial research workflows.

A product of ConductScience, Inc.

New tests and features, about once a month. Unsubscribe at any time.

Tests

  • All cognitive tests
  • Test batteries
  • Use and evidence
  • Test norms
  • Trail Making Test
  • N-Back Task
  • Automated scoring
  • Study design
  • New tests by email

Guides

  • Methods and questions
  • Blog
  • Recruitment setup
  • Participant devices
  • Prolific
  • Sona Systems
  • CloudResearch Connect
  • Qualtrics

Use cases

  • Student participant pools
  • Aging and dementia research
  • Clinical trials
  • US clinical research
  • Remote testing

Compare and buy

  • Pricing
  • Compare platforms
  • Offline edition
  • FAQ

Trust

  • Study Quality Monitor
  • HIPAA-ready testing
  • Data export
  • Privacy Policy
  • Terms of Use
  • Data Policy

Company

  • ConductScience
  • Affiliate Program
© 2026 ConductScience, Inc. Research use only.