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  6. /Stroop Color-Word Test

Clinical trials data

Stroop Color-Word Test in obesity and diabetes trials: 103 registered studies

Every registered obesity and diabetes study on ClinicalTrials.gov that names the Stroop Color-Word Test 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
103
Name it in a primary outcome, 33%
34 of 103
Of the condition's 627 studies name it, against 12% of all registered studies
16%
Other conditions
Median participants per study
61
By phase
Try the Stroop Color-Word Test

Tests named in the same studies

The library tests that obesity and diabetes studies naming the Stroop Color-Word Test name most often beside it.
  1. 1

    Trail Making Test42 studies, 15 as a primary outcome

  2. 2

    Verbal Learning28 studies, 11 as a primary outcome

  3. 3

    Verbal Fluency20 studies, 12 as a primary outcome

  4. 4

    Digit Span Test17 studies, 6 as a primary outcome

  5. 5

    Symbol Coding15 studies, 6 as a primary outcome

  6. 6

    Category Fluency9 studies, 3 as a primary outcome

  7. 7

    N-Back Task9 studies, 2 as a primary outcome

  8. 8

    Complex Figure Copy and Recall8 studies, 3 as a primary outcome

  9. 9

    Picture Naming Test7 studies, 3 as a primary outcome

  10. 10

    Card Sorting Test (Berg)6 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: 1 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: 0 studies, 0 with a test as a primary outcome20102011: 3 studies, 1 with a test as a primary outcome2012: 3 studies, 0 with a test as a primary outcome2013: 1 studies, 1 with a test as a primary outcome2014: 4 studies, 0 with a test as a primary outcome2015: 8 studies, 1 with a test as a primary outcome20152016: 5 studies, 1 with a test as a primary outcome2017: 4 studies, 0 with a test as a primary outcome2018: 1 studies, 1 with a test as a primary outcome2019: 8 studies, 2 with a test as a primary outcome2020: 5 studies, 2 with a test as a primary outcome20202021: 6 studies, 5 with a test as a primary outcome2022: 16 studies, 7 with a test as a primary outcome2023: 6 studies, 3 with a test as a primary outcome2024: 12 studies, 4 with a test as a primary outcome2025: 9 studies, 4 with a test as a primary outcome20252026: 9 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
200410
200500
200600
200700
200811
200910
201000
201131
201230
201311
201440
201581
201651
201740
201811
201982
202052
202165
2022167
202363
2024124
202594
202691

Phases and study sizes

By phase

  • Early phase 11 studies, 0 as a primary outcome
  • Phase 11 studies, 1 as a primary outcome
  • Phase 24 studies, 2 as a primary outcome
  • Phase 31 studies, 0 as a primary outcome
  • Phase 43 studies, 0 as a primary outcome
  • Not applicable74 studies, 25 as a primary outcome
  • Observational19 studies, 6 as a primary outcome

Participants per study

102050100200
  • Not applicable54 median, 35 to 115
  • Observational100 median, 62 to 140
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 the Stroop Color-Word Test, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable735435 to 115
Observational1910062 to 140

When obesity and diabetes trials measure it

Half of the primary outcomes that name the Stroop Color-Word Test are measured within 13 weeks of the start, and the middle half from 5 weeks to 6 months. 32 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day17 outcomes, 5 as a primary outcome
  • Up to 4 weeks17 outcomes, 3 as a primary outcome
  • 1 to 3 months14 outcomes, 10 as a primary outcome
  • 3 to 6 months26 outcomes, 8 as a primary outcome
  • 6 to 12 months12 outcomes, 5 as a primary outcome
  • 1 to 2 years3 outcomes, 0 as a primary outcome
  • Over 2 years9 outcomes, 1 as a primary outcome
  • No duration given5 outcomes, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

98 of the 103 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting14 studies, 6 as a primary outcome
  • Not yet recruiting10 studies, 1 as a primary outcome
  • Active, not recruiting4 studies, 0 as a primary outcome
  • Completed54 studies, 19 as a primary outcome
  • Stopped early5 studies, 3 as a primary outcome
  • Status unknown16 studies, 5 as a primary outcome

What they test

  • Behavioral34 studies, 12 as a primary outcome
  • Drug13 studies, 6 as a primary outcome
  • Device7 studies, 1 as a primary outcome
  • Dietary supplement12 studies, 3 as a primary outcome
  • Procedure5 studies, 1 as a primary outcome
  • Diagnostic test2 studies, 0 as a primary outcome
  • Biological1 studies, 0 as a primary outcome
  • Other36 studies, 15 as a primary outcome
  • None given6 studies, 2 as a primary outcome

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

Where their sites are

  • United States29 studies, 10 as a primary outcome
  • Spain11 studies, 5 as a primary outcome
  • Canada9 studies, 1 as a primary outcome
  • Türkiye6 studies, 3 as a primary outcome
  • China4 studies, 2 as a primary outcome
  • Australia3 studies, 0 as a primary outcome
  • Germany3 studies, 1 as a primary outcome
  • Italy3 studies, 0 as a primary outcome
  • Thailand3 studies, 3 as a primary outcome
  • Brazil2 studies, 0 as a primary outcome
  • Denmark2 studies, 0 as a primary outcome
  • France2 studies, 1 as a primary outcome

23 countries in all. A study with sites in several counts in each; 11 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 the Stroop Color-Word Test: 24 of 54, 44%

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

Completed obesity and diabetes studies that name the Stroop Color-Word Test and every completed study, by how they reported results
ResultsCompleted obesity and diabetes studies that name the Stroop Color-Word TestEvery completed study
Results on ClinicalTrials.gov and a paper6, 11%776, 10%
Results on ClinicalTrials.gov only2, 4%1,139, 14%
A results paper only16, 30%1,711, 22%
Neither30, 56%4,327, 54%

The 103 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
TestThe Stroop Color-Word Test

103 studies match. 34 name the Stroop Color-Word Test in a primary outcome. Median size 61 participants. Median time to the primary outcome: 13 weeks.

Loading 103 studies; the filters turn on when they arrive.

By start year
051015202000: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome20002001: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2002: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2003: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2004: 1 studies, 0 naming the Stroop Color-Word Test in a primary outcome2005: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome20052006: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2007: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2008: 1 studies, 1 naming the Stroop Color-Word Test in a primary outcome2009: 1 studies, 0 naming the Stroop Color-Word Test in a primary outcome2010: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome20102011: 3 studies, 1 naming the Stroop Color-Word Test in a primary outcome2012: 3 studies, 0 naming the Stroop Color-Word Test in a primary outcome2013: 1 studies, 1 naming the Stroop Color-Word Test in a primary outcome2014: 4 studies, 0 naming the Stroop Color-Word Test in a primary outcome2015: 8 studies, 1 naming the Stroop Color-Word Test in a primary outcome20152016: 5 studies, 1 naming the Stroop Color-Word Test in a primary outcome2017: 4 studies, 0 naming the Stroop Color-Word Test in a primary outcome2018: 1 studies, 1 naming the Stroop Color-Word Test in a primary outcome2019: 8 studies, 2 naming the Stroop Color-Word Test in a primary outcome2020: 5 studies, 2 naming the Stroop Color-Word Test in a primary outcome20202021: 6 studies, 5 naming the Stroop Color-Word Test in a primary outcome2022: 16 studies, 7 naming the Stroop Color-Word Test in a primary outcome2023: 6 studies, 3 naming the Stroop Color-Word Test in a primary outcome2024: 12 studies, 4 naming the Stroop Color-Word Test in a primary outcome2025: 9 studies, 4 naming the Stroop Color-Word Test in a primary outcome20252026: 9 studies, 1 naming the Stroop Color-Word Test 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
200410
200500
200600
200700
200811
200910
201000
201131
201230
201311
201440
201581
201651
201740
201811
201982
202052
202165
2022167
202363
2024124
202594
202691

Library tests named most

  • Stroop Color-Word Test103 studies, 34 as a primary outcome
  • Trail Making Test42 studies, 15 as a primary outcome
  • Verbal Learning28 studies, 11 as a primary outcome
  • Verbal Fluency20 studies, 12 as a primary outcome
  • Digit Span Test17 studies, 6 as a primary outcome
  • Symbol Coding15 studies, 6 as a primary outcome
  • Category Fluency9 studies, 3 as a primary outcome
  • N-Back Task9 studies, 2 as a primary outcome
  • Complex Figure Copy and Recall8 studies, 3 as a primary outcome
  • Picture Naming Test7 studies, 3 as a primary outcome

Largest condition groups

  • Obesity and diabetes103 studies, 34 as a primary outcome
  • Aging, frailty and exercise17 studies, 5 as a primary outcome
  • Cardiovascular disease9 studies, 2 as a primary outcome
  • Substance use and addiction5 studies, 1 as a primary outcome
  • Depression and bipolar disorder4 studies, 2 as a primary outcome
  • Dementia and Alzheimer's3 studies, 1 as a primary outcome
  • Mild cognitive impairment3 studies, 1 as a primary outcome
  • Pain and fatigue3 studies, 1 as a primary outcome
  • Delirium, surgery and intensive care2 studies, 0 as a primary outcome
  • Stroke1 study, 0 as a primary outcome
  • Parkinson's disease1 study, 0 as a primary outcome
  • Schizophrenia and psychosis1 study, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 5, other 98. Interventional 84, observational 19.

As a primary outcomeSecondary or other outcomeThe Stroop Color-Word Test

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
NCT07820774Start2026PhaseNot applicableConditionsObesity and diabetesParticipants54Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary16 weeks
  • Stroop Color-Word TestSecondary16 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
NCT07688564Start2026PhaseNot applicableConditionsObesity and diabetes, Pain and fatigueParticipants156Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary6 months
  • Letter-Number Sequencing TaskSecondary6 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
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
NCT07390292Start2026PhaseObservationalConditionsObesity and diabetesParticipants80Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary
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
NCT07118904Start2025PhaseNot applicableConditionsObesity and diabetes, Sleep and sleep disordersParticipants12Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestPrimary1 week
  • Symbol CodingPrimary1 week
NCT07107620Start2022PhaseObservationalConditionsObesity and diabetesParticipants141Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestSecondarysame day
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
NCT06969235Start2025PhaseNot applicableConditionsObesity and diabetesParticipants10Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary6 months
  • Stroop Color-Word TestPrimary6 months
  • Continuous Performance TestPrimary6 months
NCT06960941Start2025PhaseNot applicableConditionsObesity and diabetesParticipants24Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Symbol CodingSecondary6 months
NCT06936657Start2025PhaseNot applicableConditionsObesity and diabetesParticipants150Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary7 months
  • Stroop Color-Word TestSecondary7 months
  • N-Back TaskSecondary7 months
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
NCT06830252Start2025PhaseNot applicableConditionsObesity and diabetesParticipants50Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary12 months
NCT06819371Start2025PhaseNot applicableConditionsObesity and diabetesParticipants36Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestPrimary8 weeks
  • Verbal FluencyPrimary8 weeks
NCT06734546Start2024PhaseNot applicableConditionsDementia and Alzheimer's, Obesity and diabetesParticipants75Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal LearningSecondary6 months
NCT06721429Start2024PhaseNot applicableConditionsObesity and diabetesParticipants45Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestSecondary8 weeks
NCT06668077Start2024PhaseNot applicableConditionsObesity and diabetesParticipants141Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary4 months
  • N-Back TaskSecondary4 months
  • Go/No-Go TaskPrimary6 weeks
  • Card Sorting Test (Berg)Secondary4 months
  • Delay DiscountingSecondary4 months
  • Iowa Gambling LiteSecondary4 months
NCT06600100Start2024PhaseNot applicableConditionsObesity and diabetesParticipants54Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary4 months
  • N-Back TaskSecondary4 months
  • Card Sorting Test (Berg)Secondary4 months
  • Delay DiscountingSecondary4 months
  • Iowa Gambling LiteSecondary4 months
NCT06578325Start2021PhaseNot applicableConditionsObesity and diabetesParticipants40Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary12 weeks
  • Stroop Color-Word TestPrimary12 weeks

Page 1 of 5

Questions, answered from the data

How many obesity and diabetes trials use the Stroop Color-Word Test?

103 registered obesity and diabetes studies on ClinicalTrials.gov name it in an outcome measure, 34 of them in a primary outcome: 16% of the condition's 627 studies with a cognitive outcome, against 12% of all of them. It is the test obesity and diabetes trials name most.

Which tests do obesity and diabetes trials use with the Stroop Color-Word Test?

The Trail Making Test (42 studies), Verbal Learning (28 studies) and Verbal Fluency (20 studies).

When do obesity and diabetes trials measure the Stroop Color-Word Test?

Half of the primary outcomes that name the Stroop Color-Word Test are measured within 13 weeks of the start, and the middle half from 5 weeks to 6 months. 32 primary outcomes give a duration.

How many completed obesity and diabetes trials that use the Stroop Color-Word Test have reported results?

24 of the 54 completed studies that name it, 44%, have reported results: 8 posted them on ClinicalTrials.gov, 22 have a results paper linked to the registry record, and 6 did both. The other 30 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on the Stroop Color-Word Test and obesity and diabetes

  • Every cognitive test in obesity and diabetes trials: 627 studies
  • The Stroop Color-Word Test in all clinical trials: 1,929 studies

The Stroop Color-Word Test in other conditions

  • Aging, frailty and exercise230
  • Depression and bipolar disorder138
  • Mild cognitive impairment126
  • Parkinson's disease126
  • Dementia and Alzheimer's116
  • Pain and fatigue114
  • Stroke105
  • Healthy volunteers98
  • Sleep and sleep disorders89
  • Cardiovascular disease81
  • Anxiety, PTSD and OCD79
  • Substance use and addiction75
  • Cancer65
  • ADHD61
  • Brain injury and concussion59
  • Multiple sclerosis56

Other tests in obesity and diabetes trials

  • Trail Making Test102
  • Verbal Learning74
  • 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.

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