Clinical trials data

Category Fluency in mild cognitive impairment trials: 92 registered studies

Every registered mild cognitive impairment study on ClinicalTrials.gov that names Category Fluency in an outcome measure: how often it is a primary outcome, the tests named with it, how large the studies are and when they measure it.

Registered mild cognitive impairment studies name it in an outcome measure: 92
Name it in a primary outcome, 42%: 39 of 92
Of the condition's 859 studies name it, against 4% of all registered studies: 11%; Other conditions
Median participants per study: 69; By phase

Try Category Fluency

Tests named in the same studies

The library tests that mild cognitive impairment studies naming Category Fluency name most often beside it.

1
Trail Making Test51 studies, 24 as a primary outcome
2
Verbal Fluency48 studies, 19 as a primary outcome
3
Digit Span Test39 studies, 17 as a primary outcome
4
Verbal Learning36 studies, 23 as a primary outcome
5
Symbol Coding26 studies, 15 as a primary outcome
6
Short Story Recall26 studies, 13 as a primary outcome
7
Picture Naming Test24 studies, 7 as a primary outcome
8
Stroop Color-Word Test15 studies, 5 as a primary outcome
9
Clock Drawing Task12 studies, 6 as a primary outcome
10
Selective Reminding Task12 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.

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table

Registered studies by start year
Start year	Studies	A test as a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	2	1
2009	0	0
2010	0	0
2011	1	0
2012	4	1
2013	1	0
2014	1	1
2015	2	2
2016	6	2
2017	4	3
2018	2	1
2019	4	3
2020	9	5
2021	10	5
2022	5	1
2023	10	4
2024	12	5
2025	10	2
2026	9	3

Phases and study sizes

By phase

Early phase 12 studies, 1 as a primary outcome
Phase 14 studies, 1 as a primary outcome
Phase 219 studies, 7 as a primary outcome
Phase 32 studies, 1 as a primary outcome
Not applicable58 studies, 27 as a primary outcome
Observational7 studies, 2 as a primary outcome

Participants per study

Phase 288 median, 77 to 186
Not applicable60 median, 39 to 100

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.

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Participants per mild cognitive impairment study that names Category Fluency, by phase
Phase	Studies with a size	Median	Middle half
Phase 2	17	88	77 to 186
Not applicable	58	60	39 to 100

When mild cognitive impairment trials measure it

Half of the primary outcomes that name Category Fluency are measured within 6 months of the start, and the middle half from 13 weeks to 12 months. 35 primary outcomes give a duration.

Latest time point of each outcome

Within a day3 outcomes, 1 as a primary outcome
Up to 4 weeks5 outcomes, 1 as a primary outcome
1 to 3 months20 outcomes, 9 as a primary outcome
3 to 6 months29 outcomes, 13 as a primary outcome
6 to 12 months13 outcomes, 3 as a primary outcome
1 to 2 years12 outcomes, 7 as a primary outcome
Over 2 years6 outcomes, 1 as a primary outcome
No duration given4 outcomes, 4 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

88 of the 92 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting22 studies, 8 as a primary outcome
Not yet recruiting6 studies, 1 as a primary outcome
Active, not recruiting4 studies, 2 as a primary outcome
Completed36 studies, 15 as a primary outcome
Stopped early9 studies, 4 as a primary outcome
Status unknown15 studies, 9 as a primary outcome

What they test

Behavioral29 studies, 17 as a primary outcome
Drug20 studies, 5 as a primary outcome
Device24 studies, 8 as a primary outcome
Dietary supplement6 studies, 4 as a primary outcome
Procedure1 studies, 0 as a primary outcome
Diagnostic test1 studies, 1 as a primary outcome
Biological2 studies, 2 as a primary outcome
Radiation2 studies, 1 as a primary outcome
Combination product1 studies, 1 as a primary outcome
Other23 studies, 13 as a primary outcome
None given3 studies, 1 as a primary outcome

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

37 countries in all. A study with sites in several counts in each; 7 list no site.

Reported results

Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.

Completed mild cognitive impairment studies that name Category Fluency: 22 of 36, 61%

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

Completed mild cognitive impairment studies that name Category Fluency and every completed study, by how they reported results
Results	Completed mild cognitive impairment studies that name Category Fluency	Every completed study
Results on ClinicalTrials.gov and a paper	12, 33%	776, 10%
Results on ClinicalTrials.gov only	6, 17%	1,139, 14%
A results paper only	4, 11%	1,711, 22%
Neither	14, 39%	4,327, 54%

The 92 studies

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

92 studies match. 39 name Category Fluency in a primary outcome. Median size 69 participants. Median time to the primary outcome: 6 months.

Loading 92 studies; the filters turn on when they arrive.

By start year

2026 is partly planned starts.

Show as a table

Matching studies by start year
Start year	Studies	As a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	2	1
2009	0	0
2010	0	0
2011	1	0
2012	4	1
2013	1	0
2014	1	1
2015	2	2
2016	6	2
2017	4	3
2018	2	1
2019	4	3
2020	9	5
2021	10	5
2022	5	1
2023	10	4
2024	12	5
2025	10	2
2026	9	3

Library tests named most

Largest condition groups

Mild cognitive impairment92 studies, 39 as a primary outcome
Dementia and Alzheimer's42 studies, 11 as a primary outcome
Aging, frailty and exercise8 studies, 4 as a primary outcome
Obesity and diabetes7 studies, 4 as a primary outcome
Parkinson's disease4 studies, 1 as a primary outcome
Cancer3 studies, 0 as a primary outcome
Cardiovascular disease3 studies, 3 as a primary outcome
Depression and bipolar disorder2 studies, 0 as a primary outcome
Sleep and sleep disorders2 studies, 1 as a primary outcome
Hearing loss2 studies, 2 as a primary outcome
Brain injury and concussion1 study, 0 as a primary outcome
Multiple sclerosis1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 8, NIH 1, other 83. Interventional 85, observational 7.

As a primary outcomeSecondary or other outcomeCategory Fluency

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.
Study	Start	Phase	Conditions	Participants	Lead sponsor	Status	Library tests named, with the latest time point
NCT07842146	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants60	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondary11 months Symbol CodingSecondary11 months Category FluencySecondary11 months Delayed Recall ModuleSecondary11 months
NCT07786116	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's disease, Sleep and sleep disorders	Participants215	Lead sponsorOther	StatusRecruiting	Library tests named Category FluencyOther outcome18 months
NCT07651085	Start2024	PhaseObservational	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's disease, Sleep and sleep disorders	Participants65	Lead sponsorOther	StatusActive, not recruiting	Library tests named Verbal LearningPrimary Verbal FluencyPrimary Category FluencyPrimary Clock Drawing TaskPrimary
NCT07650318	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment, Obesity and diabetes	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Digit Span TestSecondary6 months Category FluencySecondary6 months Picture Naming TestSecondary6 months Short Story RecallSecondary6 months Delayed Recall ModuleSecondary6 months
NCT07642518	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment, Obesity and diabetes	Participants38	Lead sponsorOther	StatusNot yet recruiting	Library 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
NCT07526740	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants50	Lead sponsorOther	StatusRecruiting	Library tests named Category FluencyPrimary6 weeks
NCT07423260	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants38	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary16 weeks Category FluencyPrimary16 weeks Arithmetic Fluency TaskPrimary16 weeks
NCT07402356	Start2025	PhaseObservational	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Depression and bipolar disorder	Participants140	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Verbal LearningSecondary6 months Verbal FluencySecondary6 months N-Back TaskPrimarysame day Category FluencySecondary6 months Picture Naming TestSecondary6 months
NCT07389655	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants30	Lead sponsorOther	StatusNot yet recruiting	Library tests named Digit Span TestSecondary12 weeks Category FluencySecondary12 weeks Short Story RecallSecondary12 weeks
NCT07385937	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants150	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary18 months Verbal FluencySecondary18 months Digit Span TestSecondary18 months Category FluencySecondary18 months Clock Drawing TaskSecondary18 months Cancellation TestSecondary18 months Delayed Recall ModuleSecondary18 months
NCT07366346	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants100	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary5 months Verbal LearningPrimary5 months Verbal FluencyPrimary5 months Category FluencyPrimary5 months
NCT07241598	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants70	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary12 months Verbal FluencySecondary12 months Digit Span TestSecondary12 months Symbol CodingSecondary12 months Go/No-Go TaskSecondary12 months Category FluencySecondary12 months
NCT07210528	Start2025	PhasePhase 1	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants48	Lead sponsorOther	StatusActive, not recruiting	Library tests named Digit Span TestSecondary12 weeks Category FluencySecondary12 weeks Picture Naming TestSecondary12 weeks Short Story RecallSecondary12 weeks
NCT07064226	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants102	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Verbal FluencySecondary6 months Category FluencySecondary6 months Selective Reminding TaskSecondary6 months
NCT07031167	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants100	Lead sponsorOther	StatusNot yet recruiting	Library tests named Category FluencyOther outcome2 years
NCT06828926	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Aging, frailty and exercise	Participants50	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestPrimary8 weeks Category FluencyPrimary8 weeks
NCT06825403	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants30	Lead sponsorOther	StatusRecruiting	Library tests named Symbol CodingPrimary6 months Category FluencyPrimary6 months Short Story RecallPrimary6 months Selective Reminding TaskPrimary6 months
NCT06734286	Start2024	PhaseNot applicable	ConditionsMild cognitive impairment	Participants10	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary13 weeks Verbal LearningSecondary13 weeks Digit Span TestPrimary13 weeks Category FluencyPrimary13 weeks
NCT06733714	Start2024	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants40	Lead sponsorOther	StatusRecruiting	Library 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
NCT06705478	Start2026	PhasePhase 2	ConditionsMild cognitive impairment, Depression and bipolar disorder	Participants186	Lead sponsorNIH	StatusStopped early	Library tests named Category FluencySecondary6 months
NCT06657274	Start2024	PhaseNot applicable	ConditionsMild cognitive impairment, Parkinson's disease	Participants60	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestSecondary13 weeks Verbal FluencySecondary13 weeks Category FluencySecondary13 weeks Complex Figure Copy and RecallSecondary13 weeks Matrix ReasoningSecondary13 weeks Selective Reminding TaskPrimary13 weeks Delayed Recall ModulePrimary13 weeks
NCT06601933	Start2024	PhasePhase 2	ConditionsMild cognitive impairment	Participants240	Lead sponsorOther	StatusRecruiting	Library tests named Symbol CodingOther outcome18 months Category FluencyOther outcome18 months Short Story RecallOther outcome18 months Selective Reminding TaskOther outcome18 months
NCT06467539	Start2024	PhasePhase 2	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants80	Lead sponsorOther	StatusRecruiting	Library tests named Category FluencySecondary6 months
NCT06281652	Start2024	PhaseNot applicable	ConditionsMild cognitive impairment	Participants80	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary12 weeks Digit Span TestSecondary12 weeks Category FluencySecondary12 weeks
NCT06246929	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Aging, frailty and exercise, Pain and fatigue	Participants400	Lead sponsorOther	StatusRecruiting	Library tests named Category FluencySecondary6 months Clock Drawing TaskSecondary6 months

Questions, answered from the data

How many mild cognitive impairment trials use Category Fluency?

92 registered mild cognitive impairment studies on ClinicalTrials.gov name it in an outcome measure, 39 of them in a primary outcome: 11% of the condition's 859 studies with a cognitive outcome, against 4% of all of them. It is the 6th most named test in mild cognitive impairment trials.

Which tests do mild cognitive impairment trials use with Category Fluency?

The Trail Making Test (51 studies), Verbal Fluency (48 studies) and the Digit Span Test (39 studies).

How many participants do phase 2 mild cognitive impairment trials that use Category Fluency enroll?

Half of the phase 2 studies that name it enroll 88 participants or fewer, and the middle half enroll 77 to 186. 17 of them give a size.

When do mild cognitive impairment trials measure Category Fluency?

Half of the primary outcomes that name Category Fluency are measured within 6 months of the start, and the middle half from 13 weeks to 12 months. 35 primary outcomes give a duration.

How many completed mild cognitive impairment trials that use Category Fluency have reported results?

22 of the 36 completed studies that name it, 61%, have reported results: 18 posted them on ClinicalTrials.gov, 16 have a results paper linked to the registry record, and 12 did both. The other 14 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

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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Clinical trials data

Category Fluency in mild cognitive impairment trials: 92 registered studies

Registered mild cognitive impairment studies name it in an outcome measure: 92
Name it in a primary outcome, 42%: 39 of 92
Of the condition's 859 studies name it, against 4% of all registered studies: 11%; Other conditions
Median participants per study: 69; By phase

Try Category Fluency

Tests named in the same studies

The library tests that mild cognitive impairment studies naming Category Fluency name most often beside it.

1
Trail Making Test51 studies, 24 as a primary outcome
2
Verbal Fluency48 studies, 19 as a primary outcome
3
Digit Span Test39 studies, 17 as a primary outcome
4
Verbal Learning36 studies, 23 as a primary outcome
5
Symbol Coding26 studies, 15 as a primary outcome
6
Short Story Recall26 studies, 13 as a primary outcome
7
Picture Naming Test24 studies, 7 as a primary outcome
8
Stroop Color-Word Test15 studies, 5 as a primary outcome
9
Clock Drawing Task12 studies, 6 as a primary outcome
10
Selective Reminding Task12 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.

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table

Registered studies by start year
Start year	Studies	A test as a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	2	1
2009	0	0
2010	0	0
2011	1	0
2012	4	1
2013	1	0
2014	1	1
2015	2	2
2016	6	2
2017	4	3
2018	2	1
2019	4	3
2020	9	5
2021	10	5
2022	5	1
2023	10	4
2024	12	5
2025	10	2
2026	9	3

Phases and study sizes

By phase

Early phase 12 studies, 1 as a primary outcome
Phase 14 studies, 1 as a primary outcome
Phase 219 studies, 7 as a primary outcome
Phase 32 studies, 1 as a primary outcome
Not applicable58 studies, 27 as a primary outcome
Observational7 studies, 2 as a primary outcome

Participants per study

Phase 288 median, 77 to 186
Not applicable60 median, 39 to 100

Show as a table

Participants per mild cognitive impairment study that names Category Fluency, by phase
Phase	Studies with a size	Median	Middle half
Phase 2	17	88	77 to 186
Not applicable	58	60	39 to 100

When mild cognitive impairment trials measure it

Half of the primary outcomes that name Category Fluency are measured within 6 months of the start, and the middle half from 13 weeks to 12 months. 35 primary outcomes give a duration.

Latest time point of each outcome

Within a day3 outcomes, 1 as a primary outcome
Up to 4 weeks5 outcomes, 1 as a primary outcome
1 to 3 months20 outcomes, 9 as a primary outcome
3 to 6 months29 outcomes, 13 as a primary outcome
6 to 12 months13 outcomes, 3 as a primary outcome
1 to 2 years12 outcomes, 7 as a primary outcome
Over 2 years6 outcomes, 1 as a primary outcome
No duration given4 outcomes, 4 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

88 of the 92 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting22 studies, 8 as a primary outcome
Not yet recruiting6 studies, 1 as a primary outcome
Active, not recruiting4 studies, 2 as a primary outcome
Completed36 studies, 15 as a primary outcome
Stopped early9 studies, 4 as a primary outcome
Status unknown15 studies, 9 as a primary outcome

What they test

Behavioral29 studies, 17 as a primary outcome
Drug20 studies, 5 as a primary outcome
Device24 studies, 8 as a primary outcome
Dietary supplement6 studies, 4 as a primary outcome
Procedure1 studies, 0 as a primary outcome
Diagnostic test1 studies, 1 as a primary outcome
Biological2 studies, 2 as a primary outcome
Radiation2 studies, 1 as a primary outcome
Combination product1 studies, 1 as a primary outcome
Other23 studies, 13 as a primary outcome
None given3 studies, 1 as a primary outcome

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

37 countries in all. A study with sites in several counts in each; 7 list no site.

Reported results

Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.

Completed mild cognitive impairment studies that name Category Fluency: 22 of 36, 61%

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

Completed mild cognitive impairment studies that name Category Fluency and every completed study, by how they reported results
Results	Completed mild cognitive impairment studies that name Category Fluency	Every completed study
Results on ClinicalTrials.gov and a paper	12, 33%	776, 10%
Results on ClinicalTrials.gov only	6, 17%	1,139, 14%
A results paper only	4, 11%	1,711, 22%
Neither	14, 39%	4,327, 54%

The 92 studies

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

92 studies match. 39 name Category Fluency in a primary outcome. Median size 69 participants. Median time to the primary outcome: 6 months.

Loading 92 studies; the filters turn on when they arrive.

By start year

2026 is partly planned starts.

Show as a table

Matching studies by start year
Start year	Studies	As a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	2	1
2009	0	0
2010	0	0
2011	1	0
2012	4	1
2013	1	0
2014	1	1
2015	2	2
2016	6	2
2017	4	3
2018	2	1
2019	4	3
2020	9	5
2021	10	5
2022	5	1
2023	10	4
2024	12	5
2025	10	2
2026	9	3

Library tests named most

Largest condition groups

Mild cognitive impairment92 studies, 39 as a primary outcome
Dementia and Alzheimer's42 studies, 11 as a primary outcome
Aging, frailty and exercise8 studies, 4 as a primary outcome
Obesity and diabetes7 studies, 4 as a primary outcome
Parkinson's disease4 studies, 1 as a primary outcome
Cancer3 studies, 0 as a primary outcome
Cardiovascular disease3 studies, 3 as a primary outcome
Depression and bipolar disorder2 studies, 0 as a primary outcome
Sleep and sleep disorders2 studies, 1 as a primary outcome
Hearing loss2 studies, 2 as a primary outcome
Brain injury and concussion1 study, 0 as a primary outcome
Multiple sclerosis1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 8, NIH 1, other 83. Interventional 85, observational 7.

As a primary outcomeSecondary or other outcomeCategory Fluency

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.
Study	Start	Phase	Conditions	Participants	Lead sponsor	Status	Library tests named, with the latest time point
NCT07842146	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants60	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondary11 months Symbol CodingSecondary11 months Category FluencySecondary11 months Delayed Recall ModuleSecondary11 months
NCT07786116	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's disease, Sleep and sleep disorders	Participants215	Lead sponsorOther	StatusRecruiting	Library tests named Category FluencyOther outcome18 months
NCT07651085	Start2024	PhaseObservational	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's disease, Sleep and sleep disorders	Participants65	Lead sponsorOther	StatusActive, not recruiting	Library tests named Verbal LearningPrimary Verbal FluencyPrimary Category FluencyPrimary Clock Drawing TaskPrimary
NCT07650318	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment, Obesity and diabetes	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Digit Span TestSecondary6 months Category FluencySecondary6 months Picture Naming TestSecondary6 months Short Story RecallSecondary6 months Delayed Recall ModuleSecondary6 months
NCT07642518	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment, Obesity and diabetes	Participants38	Lead sponsorOther	StatusNot yet recruiting	Library 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
NCT07526740	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants50	Lead sponsorOther	StatusRecruiting	Library tests named Category FluencyPrimary6 weeks
NCT07423260	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants38	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary16 weeks Category FluencyPrimary16 weeks Arithmetic Fluency TaskPrimary16 weeks
NCT07402356	Start2025	PhaseObservational	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Depression and bipolar disorder	Participants140	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Verbal LearningSecondary6 months Verbal FluencySecondary6 months N-Back TaskPrimarysame day Category FluencySecondary6 months Picture Naming TestSecondary6 months
NCT07389655	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants30	Lead sponsorOther	StatusNot yet recruiting	Library tests named Digit Span TestSecondary12 weeks Category FluencySecondary12 weeks Short Story RecallSecondary12 weeks
NCT07385937	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants150	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary18 months Verbal FluencySecondary18 months Digit Span TestSecondary18 months Category FluencySecondary18 months Clock Drawing TaskSecondary18 months Cancellation TestSecondary18 months Delayed Recall ModuleSecondary18 months
NCT07366346	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants100	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary5 months Verbal LearningPrimary5 months Verbal FluencyPrimary5 months Category FluencyPrimary5 months
NCT07241598	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants70	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary12 months Verbal FluencySecondary12 months Digit Span TestSecondary12 months Symbol CodingSecondary12 months Go/No-Go TaskSecondary12 months Category FluencySecondary12 months
NCT07210528	Start2025	PhasePhase 1	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants48	Lead sponsorOther	StatusActive, not recruiting	Library tests named Digit Span TestSecondary12 weeks Category FluencySecondary12 weeks Picture Naming TestSecondary12 weeks Short Story RecallSecondary12 weeks
NCT07064226	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants102	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Verbal FluencySecondary6 months Category FluencySecondary6 months Selective Reminding TaskSecondary6 months
NCT07031167	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants100	Lead sponsorOther	StatusNot yet recruiting	Library tests named Category FluencyOther outcome2 years
NCT06828926	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Aging, frailty and exercise	Participants50	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestPrimary8 weeks Category FluencyPrimary8 weeks
NCT06825403	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants30	Lead sponsorOther	StatusRecruiting	Library tests named Symbol CodingPrimary6 months Category FluencyPrimary6 months Short Story RecallPrimary6 months Selective Reminding TaskPrimary6 months
NCT06734286	Start2024	PhaseNot applicable	ConditionsMild cognitive impairment	Participants10	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary13 weeks Verbal LearningSecondary13 weeks Digit Span TestPrimary13 weeks Category FluencyPrimary13 weeks
NCT06733714	Start2024	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants40	Lead sponsorOther	StatusRecruiting	Library 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
NCT06705478	Start2026	PhasePhase 2	ConditionsMild cognitive impairment, Depression and bipolar disorder	Participants186	Lead sponsorNIH	StatusStopped early	Library tests named Category FluencySecondary6 months
NCT06657274	Start2024	PhaseNot applicable	ConditionsMild cognitive impairment, Parkinson's disease	Participants60	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestSecondary13 weeks Verbal FluencySecondary13 weeks Category FluencySecondary13 weeks Complex Figure Copy and RecallSecondary13 weeks Matrix ReasoningSecondary13 weeks Selective Reminding TaskPrimary13 weeks Delayed Recall ModulePrimary13 weeks
NCT06601933	Start2024	PhasePhase 2	ConditionsMild cognitive impairment	Participants240	Lead sponsorOther	StatusRecruiting	Library tests named Symbol CodingOther outcome18 months Category FluencyOther outcome18 months Short Story RecallOther outcome18 months Selective Reminding TaskOther outcome18 months
NCT06467539	Start2024	PhasePhase 2	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants80	Lead sponsorOther	StatusRecruiting	Library tests named Category FluencySecondary6 months
NCT06281652	Start2024	PhaseNot applicable	ConditionsMild cognitive impairment	Participants80	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary12 weeks Digit Span TestSecondary12 weeks Category FluencySecondary12 weeks
NCT06246929	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Aging, frailty and exercise, Pain and fatigue	Participants400	Lead sponsorOther	StatusRecruiting	Library tests named Category FluencySecondary6 months Clock Drawing TaskSecondary6 months

Questions, answered from the data

How many mild cognitive impairment trials use Category Fluency?

Which tests do mild cognitive impairment trials use with Category Fluency?

The Trail Making Test (51 studies), Verbal Fluency (48 studies) and the Digit Span Test (39 studies).

How many participants do phase 2 mild cognitive impairment trials that use Category Fluency enroll?

Half of the phase 2 studies that name it enroll 88 participants or fewer, and the middle half enroll 77 to 186. 17 of them give a size.

When do mild cognitive impairment trials measure Category Fluency?

Half of the primary outcomes that name Category Fluency are measured within 6 months of the start, and the middle half from 13 weeks to 12 months. 35 primary outcomes give a duration.

How many completed mild cognitive impairment trials that use Category Fluency have reported results?

How the studies are counted

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Category Fluency in mild cognitive impairment trials: 92 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When mild cognitive impairment trials measure it

Latest time point of each outcome

Status, results, interventions and countries

Status

What they test

Where their sites are

Reported results

The 92 studies

Library tests named most

Largest condition groups

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many mild cognitive impairment trials use Category Fluency?

Which tests do mild cognitive impairment trials use with Category Fluency?

How many participants do phase 2 mild cognitive impairment trials that use Category Fluency enroll?

When do mild cognitive impairment trials measure Category Fluency?

How many completed mild cognitive impairment trials that use Category Fluency have reported results?

More on Category Fluency and mild cognitive impairment

Category Fluency in other conditions

Other tests in mild cognitive impairment trials

How the studies are counted

Run Category Fluency in your trial

Category Fluency in mild cognitive impairment trials: 92 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When mild cognitive impairment trials measure it

Latest time point of each outcome

Status, results, interventions and countries

Status

What they test

Where their sites are

Reported results

The 92 studies

Library tests named most

Largest condition groups

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many mild cognitive impairment trials use Category Fluency?

Which tests do mild cognitive impairment trials use with Category Fluency?

How many participants do phase 2 mild cognitive impairment trials that use Category Fluency enroll?

When do mild cognitive impairment trials measure Category Fluency?

How many completed mild cognitive impairment trials that use Category Fluency have reported results?

More on Category Fluency and mild cognitive impairment

Category Fluency in other conditions

Other tests in mild cognitive impairment trials

How the studies are counted

Run Category Fluency in your trial