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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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  6. /Stroop Color-Word Test

Clinical trials data

Stroop Color-Word Test in Parkinson's disease trials: 126 registered studies

Every registered Parkinson's disease 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 Parkinson's disease studies name it in an outcome measure
126
Name it in a primary outcome, 31%
39 of 126
Of the condition's 892 studies name it, against 12% of all registered studies
14%
Other conditions
Median participants per study
45
By phase
Try the Stroop Color-Word Test

Tests named in the same studies

The library tests that Parkinson's disease studies naming the Stroop Color-Word Test name most often beside it.
  1. 1

    Trail Making Test68 studies, 16 as a primary outcome

  2. 2

    Verbal Fluency42 studies, 9 as a primary outcome

  3. 3

    Digit Span Test37 studies, 8 as a primary outcome

  4. 4

    Verbal Learning21 studies, 6 as a primary outcome

  5. 5

    Symbol Coding15 studies, 6 as a primary outcome

  6. 6

    Picture Naming Test12 studies, 2 as a primary outcome

  7. 7

    Complex Figure Copy and Recall10 studies, 2 as a primary outcome

  8. 8

    Task Switching Test9 studies, 3 as a primary outcome

  9. 9

    Category Fluency9 studies, 1 as a primary outcome

  10. 10

    Go/No-Go Task8 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: 0 studies, 0 with a test as a primary outcome20052006: 0 studies, 0 with a test as a primary outcome2007: 1 studies, 0 with a test as a primary outcome2008: 0 studies, 0 with a test as a primary outcome2009: 1 studies, 0 with a test as a primary outcome2010: 2 studies, 1 with a test as a primary outcome20102011: 2 studies, 1 with a test as a primary outcome2012: 2 studies, 1 with a test as a primary outcome2013: 1 studies, 0 with a test as a primary outcome2014: 4 studies, 0 with a test as a primary outcome2015: 3 studies, 1 with a test as a primary outcome20152016: 4 studies, 1 with a test as a primary outcome2017: 8 studies, 0 with a test as a primary outcome2018: 7 studies, 1 with a test as a primary outcome2019: 13 studies, 5 with a test as a primary outcome2020: 6 studies, 2 with a test as a primary outcome20202021: 14 studies, 5 with a test as a primary outcome2022: 11 studies, 4 with a test as a primary outcome2023: 8 studies, 3 with a test as a primary outcome2024: 9 studies, 4 with a test as a primary outcome2025: 10 studies, 3 with a test as a primary outcome20252026: 20 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
200300
200400
200500
200600
200710
200800
200910
201021
201121
201221
201310
201440
201531
201641
201780
201871
2019135
202062
2021145
2022114
202383
202494
2025103
2026207

Phases and study sizes

By phase

  • Phase 12 studies, 0 as a primary outcome
  • Phase 1/24 studies, 1 as a primary outcome
  • Phase 23 studies, 0 as a primary outcome
  • Phase 33 studies, 2 as a primary outcome
  • Phase 42 studies, 0 as a primary outcome
  • Not applicable94 studies, 26 as a primary outcome
  • Observational18 studies, 10 as a primary outcome

Participants per study

102050100200
  • Not applicable40 median, 28 to 60
  • Observational100 median, 50 to 242
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 Parkinson's disease study that names the Stroop Color-Word Test, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable934028 to 60
Observational1710050 to 242

When Parkinson's disease trials measure it

Half of the primary outcomes that name the Stroop Color-Word Test are measured within 8 weeks of the start, and the middle half from 4 days to 4 months. 38 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day21 outcomes, 8 as a primary outcome
  • Up to 4 weeks24 outcomes, 8 as a primary outcome
  • 1 to 3 months38 outcomes, 11 as a primary outcome
  • 3 to 6 months14 outcomes, 5 as a primary outcome
  • 6 to 12 months11 outcomes, 4 as a primary outcome
  • 1 to 2 years5 outcomes, 0 as a primary outcome
  • Over 2 years7 outcomes, 2 as a primary outcome
  • No duration given6 outcomes, 1 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

120 of the 126 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting24 studies, 7 as a primary outcome
  • Not yet recruiting11 studies, 4 as a primary outcome
  • Active, not recruiting4 studies, 1 as a primary outcome
  • Completed54 studies, 18 as a primary outcome
  • Stopped early4 studies, 2 as a primary outcome
  • Status unknown29 studies, 7 as a primary outcome

What they test

  • Behavioral36 studies, 10 as a primary outcome
  • Drug10 studies, 2 as a primary outcome
  • Device32 studies, 4 as a primary outcome
  • Dietary supplement1 studies, 1 as a primary outcome
  • Procedure3 studies, 1 as a primary outcome
  • Diagnostic test3 studies, 1 as a primary outcome
  • Biological2 studies, 0 as a primary outcome
  • Other45 studies, 18 as a primary outcome
  • None given6 studies, 5 as a primary outcome

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

Where their sites are

  • United States26 studies, 12 as a primary outcome
  • Italy12 studies, 4 as a primary outcome
  • Taiwan12 studies, 6 as a primary outcome
  • Türkiye10 studies, 5 as a primary outcome
  • Germany9 studies, 1 as a primary outcome
  • Sweden7 studies, 2 as a primary outcome
  • Brazil6 studies, 2 as a primary outcome
  • Netherlands6 studies, 0 as a primary outcome
  • France5 studies, 1 as a primary outcome
  • Spain5 studies, 1 as a primary outcome
  • Switzerland5 studies, 1 as a primary outcome
  • Canada4 studies, 0 as a primary outcome

29 countries in all. A study with sites in several counts in each; 6 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 Parkinson's disease studies that name the Stroop Color-Word Test: 25 of 54, 46%

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

Completed Parkinson's disease studies that name the Stroop Color-Word Test and every completed study, by how they reported results
ResultsCompleted Parkinson's disease studies that name the Stroop Color-Word TestEvery completed study
Results on ClinicalTrials.gov and a paper3, 6%776, 10%
Results on ClinicalTrials.gov only11, 20%1,139, 14%
A results paper only11, 20%1,711, 22%
Neither29, 54%4,327, 54%

The 126 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionParkinson's disease
TestThe Stroop Color-Word Test

126 studies match. 39 name the Stroop Color-Word Test in a primary outcome. Median size 45 participants. Median time to the primary outcome: 8 weeks.

Loading 126 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: 0 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: 1 studies, 0 naming the Stroop Color-Word Test in a primary outcome2008: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2009: 1 studies, 0 naming the Stroop Color-Word Test in a primary outcome2010: 2 studies, 1 naming the Stroop Color-Word Test in a primary outcome20102011: 2 studies, 1 naming the Stroop Color-Word Test in a primary outcome2012: 2 studies, 1 naming the Stroop Color-Word Test in a primary outcome2013: 1 studies, 0 naming the Stroop Color-Word Test in a primary outcome2014: 4 studies, 0 naming the Stroop Color-Word Test in a primary outcome2015: 3 studies, 1 naming the Stroop Color-Word Test in a primary outcome20152016: 4 studies, 1 naming the Stroop Color-Word Test in a primary outcome2017: 8 studies, 0 naming the Stroop Color-Word Test in a primary outcome2018: 7 studies, 1 naming the Stroop Color-Word Test in a primary outcome2019: 13 studies, 5 naming the Stroop Color-Word Test in a primary outcome2020: 6 studies, 2 naming the Stroop Color-Word Test in a primary outcome20202021: 14 studies, 5 naming the Stroop Color-Word Test in a primary outcome2022: 11 studies, 4 naming the Stroop Color-Word Test in a primary outcome2023: 8 studies, 3 naming the Stroop Color-Word Test in a primary outcome2024: 9 studies, 4 naming the Stroop Color-Word Test in a primary outcome2025: 10 studies, 3 naming the Stroop Color-Word Test in a primary outcome20252026: 20 studies, 7 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
200400
200500
200600
200710
200800
200910
201021
201121
201221
201310
201440
201531
201641
201780
201871
2019135
202062
2021145
2022114
202383
202494
2025103
2026207

Library tests named most

  • Stroop Color-Word Test126 studies, 39 as a primary outcome
  • Trail Making Test68 studies, 16 as a primary outcome
  • Verbal Fluency42 studies, 9 as a primary outcome
  • Digit Span Test37 studies, 8 as a primary outcome
  • Verbal Learning21 studies, 6 as a primary outcome
  • Symbol Coding15 studies, 6 as a primary outcome
  • Picture Naming Test12 studies, 2 as a primary outcome
  • Complex Figure Copy and Recall10 studies, 2 as a primary outcome
  • Task Switching Test9 studies, 3 as a primary outcome
  • Category Fluency9 studies, 1 as a primary outcome

Conditions

  • Parkinson's disease126 studies, 39 as a primary outcome
  • Aging, frailty and exercise13 studies, 6 as a primary outcome
  • Mild cognitive impairment11 studies, 2 as a primary outcome
  • Dementia and Alzheimer's7 studies, 2 as a primary outcome
  • Stroke6 studies, 0 as a primary outcome
  • Multiple sclerosis4 studies, 0 as a primary outcome
  • Sleep and sleep disorders3 studies, 1 as a primary outcome
  • Healthy volunteers2 studies, 1 as a primary outcome
  • Epilepsy2 studies, 1 as a primary outcome
  • Brain injury and concussion1 study, 1 as a primary outcome
  • Obesity and diabetes1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 2, other 124. Interventional 108, observational 18.

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
NCT07907718Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants50Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestPrimary8 weeks
  • Stroop Color-Word TestPrimary8 weeks
  • Go/No-Go TaskPrimary8 weeks
NCT07865260Start2026PhaseNot applicableConditionsMild cognitive impairment, Stroke, Parkinson's diseaseParticipants80Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary8 weeks
  • Stroop Color-Word TestSecondary8 weeks
  • Corsi Block-Tapping TestSecondary8 weeks
NCT07860294Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants120Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary6 months
NCT07813156Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants24Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary
  • Digit Span TestSecondary
  • Picture Naming TestSecondary
  • Clock Drawing TaskSecondary
  • Letter-Number Sequencing TaskSecondary
  • Selective Reminding TaskSecondary
  • Line Angle MatchingSecondary
NCT07777419Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants20Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondarysame day
  • Verbal FluencyPrimarysame day
  • Go/No-Go TaskSecondarysame day
  • Category FluencyPrimarysame day
NCT07678983Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants66Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Trail Making TestSecondary8 weeks
  • Stroop Color-Word TestSecondary8 weeks
  • Verbal FluencySecondary8 weeks
  • Digit Span TestSecondary8 weeks
  • Category FluencySecondary8 weeks
NCT07636538Start2026PhaseNot applicableConditionsMild cognitive impairment, Stroke, Parkinson's diseaseParticipants30Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary
  • Stroop Color-Word TestSecondary
  • Digit Span TestSecondary
NCT07630194Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants90Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary12 weeks
  • Stroop Color-Word TestSecondary12 weeks
  • Clock Drawing TaskSecondary12 weeks
NCT07616050Start2026PhaseNot applicableConditionsMild cognitive impairment, Stroke, Parkinson's disease, Multiple sclerosis, Aging, frailty and exerciseParticipants70Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary9 weeks
  • Stroop Color-Word TestSecondary9 weeks
NCT07611578Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants112Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestPrimary8 weeks
NCT07540325Start2026PhaseObservationalConditionsParkinson's diseaseParticipants30Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestPrimarysame day
  • Verbal LearningPrimarysame day
  • Digit Span TestPrimarysame day
  • Picture Naming TestPrimarysame day
  • Line Angle MatchingPrimarysame day
NCT07536490Start2026PhaseObservationalConditionsParkinson's disease, Sleep and sleep disordersParticipants69Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestPrimarysame day
  • Clock Drawing TaskPrimarysame day
NCT07536022Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants16Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestOther outcome8 weeks
  • Verbal FluencyOther outcome8 weeks
  • Digit Span TestOther outcome8 weeks
NCT07494461Start2026PhaseObservationalConditionsParkinson's diseaseParticipants50Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestPrimarysame day
  • Go/No-Go TaskPrimarysame day
NCT07478146Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary12 weeks
  • Stroop Color-Word TestPrimary12 weeks
NCT07440563Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants20Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary3 weeks
  • Stroop Color-Word TestSecondary3 weeks
  • Task Switching TestSecondary3 weeks
NCT07424365Start2025PhaseNot applicableConditionsMild cognitive impairment, Parkinson's disease, Healthy volunteersParticipants80Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary6 months
NCT07411365Start2026PhaseNot applicableConditionsMild cognitive impairment, Parkinson's diseaseParticipants42Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestPrimary12 months
NCT07355842Start2026PhaseNot applicableConditionsParkinson's disease, Sleep and sleep disordersParticipants80Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary18 months
  • Stroop Color-Word TestSecondary18 months
  • Verbal LearningSecondary18 months
  • Verbal FluencySecondary18 months
  • Digit Span TestSecondary18 months
  • Category FluencySecondary18 months
  • Picture Naming TestSecondary18 months
  • Psychomotor Vigilance TaskOther outcome18 months
  • Complex Figure Copy and RecallSecondary18 months
  • Finger Tapping TaskSecondary18 months
  • Sustained Attention to ResponseOther outcome18 months
  • Line Angle MatchingSecondary18 months
NCT07322458Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants40Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary
NCT07271927Start2025PhaseNot applicableConditionsParkinson's diseaseParticipants15Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary10 weeks
  • Stroop Color-Word TestSecondary10 weeks
  • Verbal LearningSecondary10 weeks
  • Digit Span TestSecondary10 weeks
  • Complex Figure Copy and RecallSecondary10 weeks
NCT07055087Start2026PhasePhase 2ConditionsParkinson's diseaseParticipants120Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary2 years
  • Stroop Color-Word TestSecondary2 years
  • Verbal LearningSecondary2 years
  • Verbal FluencySecondary2 years
  • Category FluencySecondary2 years
  • Picture Naming TestSecondary2 years
  • Short Story RecallSecondary2 years
  • Line Angle MatchingSecondary2 years
NCT06962930Start2025PhaseNot applicableConditionsParkinson's diseaseParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondarysame day
  • Symbol CodingSecondarysame day
NCT06932679Start2025PhaseObservationalConditionsParkinson's diseaseParticipants180Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondarysame day
NCT06920511Start2025PhaseNot applicableConditionsMild cognitive impairment, Parkinson's diseaseParticipants10Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestOther outcome4 weeks
  • Stroop Color-Word TestOther outcome4 weeks

Page 1 of 6

Questions, answered from the data

How many Parkinson's disease trials use the Stroop Color-Word Test?

126 registered Parkinson's disease studies on ClinicalTrials.gov name it in an outcome measure, 39 of them in a primary outcome: 14% of the condition's 892 studies with a cognitive outcome, against 12% of all of them. It is the 3rd most named test in Parkinson's disease trials.

Which tests do Parkinson's disease trials use with the Stroop Color-Word Test?

The Trail Making Test (68 studies), Verbal Fluency (42 studies) and the Digit Span Test (37 studies).

When do Parkinson's disease trials measure the Stroop Color-Word Test?

Half of the primary outcomes that name the Stroop Color-Word Test are measured within 8 weeks of the start, and the middle half from 4 days to 4 months. 38 primary outcomes give a duration.

How many completed Parkinson's disease trials that use the Stroop Color-Word Test have reported results?

25 of the 54 completed studies that name it, 46%, have reported results: 14 posted them on ClinicalTrials.gov, 14 have a results paper linked to the registry record, and 3 did both. The other 29 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on the Stroop Color-Word Test and Parkinson's disease

  • Every cognitive test in Parkinson's disease trials: 892 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
  • Dementia and Alzheimer's116
  • Pain and fatigue114
  • Stroke105
  • Obesity and diabetes103
  • 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 Parkinson's disease trials

  • Trail Making Test156
  • Verbal Fluency140
  • Digit Span Test86
  • Verbal Learning61

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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