Clinical trials data

Digit Span Test in healthy volunteer trials: 64 registered studies

Every registered healthy volunteers study on ClinicalTrials.gov that names the Digit Span 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 healthy volunteers studies name it in an outcome measure: 64
Name it in a primary outcome, 48%: 31 of 64
Of the condition's 656 studies name it, against 10% of all registered studies: 10%; Other conditions
Median participants per study: 90; By phase

Try the Digit Span Test

Tests named in the same studies

The library tests that healthy volunteers studies naming the Digit Span Test name most often beside it.

1
Stroop Color-Word Test20 studies, 11 as a primary outcome
2
Trail Making Test19 studies, 11 as a primary outcome
3
Verbal Fluency11 studies, 1 as a primary outcome
4
Card Sorting Test (Berg)10 studies, 7 as a primary outcome
5
Verbal Learning10 studies, 6 as a primary outcome
6
Matrix Reasoning8 studies, 4 as a primary outcome
7
Task Switching Test6 studies, 6 as a primary outcome
8
Symbol Coding6 studies, 4 as a primary outcome
9
Go/No-Go Task5 studies, 2 as a primary outcome
10
N-Back Task5 studies, 2 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	1	1
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	0	0
2009	0	0
2010	2	2
2011	1	0
2012	2	2
2013	3	2
2014	2	2
2015	5	1
2016	5	1
2017	4	2
2018	1	0
2019	6	3
2020	1	0
2021	1	1
2022	4	2
2023	6	2
2024	3	1
2025	8	4
2026	7	4

Phases and study sizes

By phase

Phase 12 studies, 1 as a primary outcome
Phase 1/21 studies, 0 as a primary outcome
Phase 23 studies, 1 as a primary outcome
Phase 41 studies, 1 as a primary outcome
Not applicable49 studies, 22 as a primary outcome
Observational8 studies, 6 as a primary outcome

Participants per study

Not applicable90 median, 44 to 200

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 healthy volunteers study that names the Digit Span Test, by phase
Phase	Studies with a size	Median	Middle half
Not applicable	49	90	44 to 200

When healthy volunteer trials measure it

Half of the primary outcomes that name the Digit Span Test are measured within 6 weeks of the start, and the middle half from 1 week to 4 months. 28 primary outcomes give a duration.

Latest time point of each outcome

Within a day15 outcomes, 5 as a primary outcome
Up to 4 weeks13 outcomes, 8 as a primary outcome
1 to 3 months18 outcomes, 7 as a primary outcome
3 to 6 months8 outcomes, 5 as a primary outcome
6 to 12 months2 outcomes, 1 as a primary outcome
1 to 2 years2 outcomes, 1 as a primary outcome
Over 2 years1 outcomes, 1 as a primary outcome
No duration given5 outcomes, 3 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

59 of the 64 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting8 studies, 5 as a primary outcome
Not yet recruiting3 studies, 2 as a primary outcome
Active, not recruiting1 studies, 0 as a primary outcome
Completed41 studies, 18 as a primary outcome
Stopped early2 studies, 1 as a primary outcome
Status unknown9 studies, 5 as a primary outcome

What they test

Behavioral22 studies, 11 as a primary outcome
Drug9 studies, 3 as a primary outcome
Device8 studies, 3 as a primary outcome
Dietary supplement9 studies, 5 as a primary outcome
Procedure1 studies, 0 as a primary outcome
Diagnostic test2 studies, 1 as a primary outcome
Other19 studies, 8 as a primary outcome
None given3 studies, 2 as a primary outcome

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

21 countries in all. A study with sites in several counts in each; 8 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 healthy volunteers studies that name the Digit Span Test: 16 of 41, 39%

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

Completed healthy volunteers studies that name the Digit Span Test and every completed study, by how they reported results
Results	Completed healthy volunteers studies that name the Digit Span Test	Every completed study
Results on ClinicalTrials.gov and a paper	0, 0%	776, 10%
Results on ClinicalTrials.gov only	5, 12%	1,139, 14%
A results paper only	11, 27%	1,711, 22%
Neither	25, 61%	4,327, 54%

The 64 studies

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

64 studies match. 31 name the Digit Span Test in a primary outcome. Median size 90 participants. Median time to the primary outcome: 6 weeks.

Loading 64 studies; the filters turn on when they arrive.

By start year

2026 is partly planned starts. Not shown: 1 that started before 2000 and 1 planned to start after 2026.

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	1	1
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	0	0
2009	0	0
2010	2	2
2011	1	0
2012	2	2
2013	3	2
2014	2	2
2015	5	1
2016	5	1
2017	4	2
2018	1	0
2019	6	3
2020	1	0
2021	1	1
2022	4	2
2023	6	2
2024	3	1
2025	8	4
2026	7	4

Library tests named most

Conditions

Healthy volunteers64 studies, 31 as a primary outcome
Aging, frailty and exercise22 studies, 9 as a primary outcome
Mild cognitive impairment10 studies, 5 as a primary outcome
Dementia and Alzheimer's6 studies, 5 as a primary outcome
Sleep and sleep disorders4 studies, 0 as a primary outcome
Anxiety, PTSD and OCD3 studies, 1 as a primary outcome
Parkinson's disease2 studies, 1 as a primary outcome
Depression and bipolar disorder2 studies, 1 as a primary outcome
Pain and fatigue2 studies, 1 as a primary outcome
Stroke1 study, 1 as a primary outcome
Brain injury and concussion1 study, 0 as a primary outcome
Substance use and addiction1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 7, other 57. Interventional 56, observational 8.

As a primary outcomeSecondary or other outcomeThe Digit Span 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.
Study	Start	Phase	Conditions	Participants	Lead sponsor	Status	Library tests named, with the latest time point
NCT07841457	Start2027	PhaseNot applicable	ConditionsHealthy volunteers	Participants20	Lead sponsorIndustry	StatusNot yet recruiting	Library tests named Digit Span TestSecondary4 weeks Matrix ReasoningSecondary4 weeks
NCT07809412	Start2025	PhaseNot applicable	ConditionsHealthy volunteers	Participants20	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestPrimary1 week Stroop Color-Word TestPrimary1 week Digit Span TestPrimary1 week Cancellation TestPrimary1 week Line Angle MatchingPrimary1 week
NCT07650006	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants30	Lead sponsorOther	StatusCompleted	Library tests named Stroop Color-Word TestSecondary12 weeks Digit Span TestSecondary12 weeks N-Back TaskSecondary12 weeks
NCT07637487	Start2023	PhaseNot applicable	ConditionsHealthy volunteers	Participants220	Lead sponsorOther	StatusRecruiting	Library tests named Verbal LearningSecondary6 months Digit Span TestSecondary6 months
NCT07623811	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants313	Lead sponsorIndustry	StatusCompleted	Library tests named Verbal FluencySecondarysame day Digit Span TestPrimarysame day Matrix ReasoningPrimarysame day
NCT07598409	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Healthy volunteers, Aging, frailty and exercise	Participants156	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary13 weeks Digit Span TestSecondary13 weeks
NCT07572240	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants72	Lead sponsorIndustry	StatusActive, not recruiting	Library tests named Stroop Color-Word TestPrimary8 weeks Digit Span TestSecondary8 weeks Continuous Performance TestSecondary8 weeks
NCT07569120	Start2026	PhaseNot applicable	ConditionsParkinson's disease, Healthy volunteers, Aging, frailty and exercise	Participants165	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary2 days Verbal FluencySecondary2 days Digit Span TestSecondary2 days Category FluencySecondary2 days Tower PlanningSecondary2 days
NCT07556250	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants225	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary1 week Stroop Color-Word TestPrimary2 weeks Verbal FluencySecondary1 week Digit Span TestPrimary1 week Card Sorting Test (Berg)Primary1 week Task Switching TestPrimary1 week Matrix ReasoningSecondary2 weeks Delay DiscountingSecondary2 weeks Tower PlanningSecondary1 week Iowa Gambling LiteSecondary1 week Probabilistic Reversal LearningPrimary1 week One-Touch Tower PlanningSecondary1 week Intra/Extra Dimensional Set ShiftPrimary1 week Betting Choice TaskSecondary1 week Alternative Uses TaskSecondary1 week Social Value OrientationSecondary2 weeks Remote Associates TestSecondary1 week Repeated Prisoner's DilemmaSecondary2 weeks Ellsberg Urns TaskSecondary2 weeks
NCT07494149	Start2026	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants158	Lead sponsorOther	StatusRecruiting	Library tests named Digit Span TestPrimary4 months Card Sorting Test (Berg)Primary4 months Corsi Block-Tapping TestPrimary4 months
NCT07443904	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants297	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary12 weeks Stroop Color-Word TestPrimary12 weeks Digit Span TestPrimary12 weeks
NCT07443189	Start2021	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants233	Lead sponsorOther	StatusCompleted Paper	Library tests named Digit Span TestPrimary6 months N-Back TaskPrimary6 months Continuous Performance TestPrimary6 months Picture Naming TestPrimary6 months Eriksen Flanker TaskPrimary6 months Task Switching TestPrimary6 months AX Continuous Performance TestWording unclear Attention Network TestPrimary6 months Posner CueingPrimary6 months
NCT07379164	Start2025	PhaseNot applicable	ConditionsHealthy volunteers, Pain and fatigue	Participants80	Lead sponsorOther	StatusCompleted	Library tests named Digit Span TestSecondarysame day
NCT07258433	Start2025	PhaseNot applicable	ConditionsHealthy volunteers, Sleep and sleep disorders	Participants120	Lead sponsorIndustry	StatusCompleted	Library tests named Digit Span TestSecondary6 weeks
NCT07208279	Start2025	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants16	Lead sponsorOther	StatusRecruiting	Library tests named Verbal LearningPrimary6 weeks Digit Span TestPrimary6 weeks Symbol CodingPrimary6 weeks
NCT07144930	Start2025	PhaseNot applicable	ConditionsStroke, Healthy volunteers	Participants210	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary4 months Stroop Color-Word TestPrimary4 months Digit Span TestPrimary4 months Task Switching TestPrimary4 months
NCT07132281	Start2025	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants120	Lead sponsorOther	StatusRecruiting	Library tests named Digit Span TestPrimary12 weeks Card Sorting Test (Berg)Primary12 weeks Task Switching TestPrimary12 weeks Short Story RecallPrimary12 weeks Matrix ReasoningPrimary12 weeks Remote Associates TestPrimary12 weeks
NCT07039708	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Healthy volunteers, Aging, frailty and exercise	Participants60	Lead sponsorOther	StatusStopped early	Library tests named Verbal FluencySecondary9 weeks Digit Span TestSecondary9 weeks
NCT06816667	Start2024	PhasePhase 1/2	ConditionsDepression and bipolar disorder, Healthy volunteers, Anxiety, PTSD and OCD	Participants40	Lead sponsorIndustry	StatusCompleted Paper	Library tests named Verbal FluencySecondary5 weeks Digit Span TestSecondary5 weeks Paced Visual Serial Addition TestSecondary5 weeks
NCT06616285	Start2024	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants80	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestSecondary6 months Stroop Color-Word TestSecondary6 months Verbal FluencySecondary6 months Digit Span TestSecondary6 months Symbol CodingSecondary6 months Probabilistic Reversal LearningSecondary6 months Effort Discounting TaskSecondary6 months
NCT06588920	Start2024	PhaseObservational	ConditionsParkinson's disease, Healthy volunteers, Aging, frailty and exercise	Participants70	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimarysame day Stroop Color-Word TestPrimarysame day Digit Span TestPrimarysame day Go/No-Go TaskPrimarysame day
NCT06425679	Start2023	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants120	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestPrimary11 months Stroop Color-Word TestSecondary11 months Digit Span TestSecondary11 months Symbol CodingSecondary11 months Clock Drawing TaskSecondary11 months
NCT06412887	Start2023	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants24	Lead sponsorOther	StatusCompleted	Library tests named Digit Span TestSecondarysame day
NCT06240286	Start2015	PhaseNot applicable	ConditionsHealthy volunteers	Participants44	Lead sponsorOther	StatusCompleted Paper	Library tests named Stroop Color-Word TestPrimary4 days Digit Span TestPrimary4 days Paired Associate LearningPrimary4 days Letter Pair Reasoning TaskPrimary4 days
NCT06090942	Start2023	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants90	Lead sponsorOther	StatusStatus unknown	Library tests named Stroop Color-Word TestSecondary6 months Digit Span TestSecondary6 months Card Sorting Test (Berg)Secondary6 months

Questions, answered from the data

How many healthy volunteer trials use the Digit Span Test?

64 registered healthy volunteers studies on ClinicalTrials.gov name it in an outcome measure, 31 of them in a primary outcome: 10% of the condition's 656 studies with a cognitive outcome, against 10% of all of them. It is the 3rd most named test in healthy volunteer trials.

Which tests do healthy volunteer trials use with the Digit Span Test?

The Stroop Color-Word Test (20 studies), the Trail Making Test (19 studies) and Verbal Fluency (11 studies).

When do healthy volunteer trials measure the Digit Span Test?

Half of the primary outcomes that name the Digit Span Test are measured within 6 weeks of the start, and the middle half from 1 week to 4 months. 28 primary outcomes give a duration.

How many completed healthy volunteer trials that use the Digit Span Test have reported results?

16 of the 41 completed studies that name it, 39%, have reported results: 5 posted them on ClinicalTrials.gov, 11 have a results paper linked to the registry record, and 0 did both. The other 25 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

Digit Span Test in healthy volunteer trials: 64 registered studies

Registered healthy volunteers studies name it in an outcome measure: 64
Name it in a primary outcome, 48%: 31 of 64
Of the condition's 656 studies name it, against 10% of all registered studies: 10%; Other conditions
Median participants per study: 90; By phase

Try the Digit Span Test

Tests named in the same studies

The library tests that healthy volunteers studies naming the Digit Span Test name most often beside it.

1
Stroop Color-Word Test20 studies, 11 as a primary outcome
2
Trail Making Test19 studies, 11 as a primary outcome
3
Verbal Fluency11 studies, 1 as a primary outcome
4
Card Sorting Test (Berg)10 studies, 7 as a primary outcome
5
Verbal Learning10 studies, 6 as a primary outcome
6
Matrix Reasoning8 studies, 4 as a primary outcome
7
Task Switching Test6 studies, 6 as a primary outcome
8
Symbol Coding6 studies, 4 as a primary outcome
9
Go/No-Go Task5 studies, 2 as a primary outcome
10
N-Back Task5 studies, 2 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	1	1
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	0	0
2009	0	0
2010	2	2
2011	1	0
2012	2	2
2013	3	2
2014	2	2
2015	5	1
2016	5	1
2017	4	2
2018	1	0
2019	6	3
2020	1	0
2021	1	1
2022	4	2
2023	6	2
2024	3	1
2025	8	4
2026	7	4

Phases and study sizes

By phase

Phase 12 studies, 1 as a primary outcome
Phase 1/21 studies, 0 as a primary outcome
Phase 23 studies, 1 as a primary outcome
Phase 41 studies, 1 as a primary outcome
Not applicable49 studies, 22 as a primary outcome
Observational8 studies, 6 as a primary outcome

Participants per study

Not applicable90 median, 44 to 200

Show as a table

Participants per healthy volunteers study that names the Digit Span Test, by phase
Phase	Studies with a size	Median	Middle half
Not applicable	49	90	44 to 200

When healthy volunteer trials measure it

Half of the primary outcomes that name the Digit Span Test are measured within 6 weeks of the start, and the middle half from 1 week to 4 months. 28 primary outcomes give a duration.

Latest time point of each outcome

Within a day15 outcomes, 5 as a primary outcome
Up to 4 weeks13 outcomes, 8 as a primary outcome
1 to 3 months18 outcomes, 7 as a primary outcome
3 to 6 months8 outcomes, 5 as a primary outcome
6 to 12 months2 outcomes, 1 as a primary outcome
1 to 2 years2 outcomes, 1 as a primary outcome
Over 2 years1 outcomes, 1 as a primary outcome
No duration given5 outcomes, 3 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

59 of the 64 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting8 studies, 5 as a primary outcome
Not yet recruiting3 studies, 2 as a primary outcome
Active, not recruiting1 studies, 0 as a primary outcome
Completed41 studies, 18 as a primary outcome
Stopped early2 studies, 1 as a primary outcome
Status unknown9 studies, 5 as a primary outcome

What they test

Behavioral22 studies, 11 as a primary outcome
Drug9 studies, 3 as a primary outcome
Device8 studies, 3 as a primary outcome
Dietary supplement9 studies, 5 as a primary outcome
Procedure1 studies, 0 as a primary outcome
Diagnostic test2 studies, 1 as a primary outcome
Other19 studies, 8 as a primary outcome
None given3 studies, 2 as a primary outcome

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

21 countries in all. A study with sites in several counts in each; 8 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 healthy volunteers studies that name the Digit Span Test: 16 of 41, 39%

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

Completed healthy volunteers studies that name the Digit Span Test and every completed study, by how they reported results
Results	Completed healthy volunteers studies that name the Digit Span Test	Every completed study
Results on ClinicalTrials.gov and a paper	0, 0%	776, 10%
Results on ClinicalTrials.gov only	5, 12%	1,139, 14%
A results paper only	11, 27%	1,711, 22%
Neither	25, 61%	4,327, 54%

The 64 studies

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

64 studies match. 31 name the Digit Span Test in a primary outcome. Median size 90 participants. Median time to the primary outcome: 6 weeks.

Loading 64 studies; the filters turn on when they arrive.

By start year

2026 is partly planned starts. Not shown: 1 that started before 2000 and 1 planned to start after 2026.

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	1	1
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	0	0
2009	0	0
2010	2	2
2011	1	0
2012	2	2
2013	3	2
2014	2	2
2015	5	1
2016	5	1
2017	4	2
2018	1	0
2019	6	3
2020	1	0
2021	1	1
2022	4	2
2023	6	2
2024	3	1
2025	8	4
2026	7	4

Library tests named most

Conditions

Healthy volunteers64 studies, 31 as a primary outcome
Aging, frailty and exercise22 studies, 9 as a primary outcome
Mild cognitive impairment10 studies, 5 as a primary outcome
Dementia and Alzheimer's6 studies, 5 as a primary outcome
Sleep and sleep disorders4 studies, 0 as a primary outcome
Anxiety, PTSD and OCD3 studies, 1 as a primary outcome
Parkinson's disease2 studies, 1 as a primary outcome
Depression and bipolar disorder2 studies, 1 as a primary outcome
Pain and fatigue2 studies, 1 as a primary outcome
Stroke1 study, 1 as a primary outcome
Brain injury and concussion1 study, 0 as a primary outcome
Substance use and addiction1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 7, other 57. Interventional 56, observational 8.

As a primary outcomeSecondary or other outcomeThe Digit Span 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.
Study	Start	Phase	Conditions	Participants	Lead sponsor	Status	Library tests named, with the latest time point
NCT07841457	Start2027	PhaseNot applicable	ConditionsHealthy volunteers	Participants20	Lead sponsorIndustry	StatusNot yet recruiting	Library tests named Digit Span TestSecondary4 weeks Matrix ReasoningSecondary4 weeks
NCT07809412	Start2025	PhaseNot applicable	ConditionsHealthy volunteers	Participants20	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestPrimary1 week Stroop Color-Word TestPrimary1 week Digit Span TestPrimary1 week Cancellation TestPrimary1 week Line Angle MatchingPrimary1 week
NCT07650006	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants30	Lead sponsorOther	StatusCompleted	Library tests named Stroop Color-Word TestSecondary12 weeks Digit Span TestSecondary12 weeks N-Back TaskSecondary12 weeks
NCT07637487	Start2023	PhaseNot applicable	ConditionsHealthy volunteers	Participants220	Lead sponsorOther	StatusRecruiting	Library tests named Verbal LearningSecondary6 months Digit Span TestSecondary6 months
NCT07623811	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants313	Lead sponsorIndustry	StatusCompleted	Library tests named Verbal FluencySecondarysame day Digit Span TestPrimarysame day Matrix ReasoningPrimarysame day
NCT07598409	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Healthy volunteers, Aging, frailty and exercise	Participants156	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary13 weeks Digit Span TestSecondary13 weeks
NCT07572240	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants72	Lead sponsorIndustry	StatusActive, not recruiting	Library tests named Stroop Color-Word TestPrimary8 weeks Digit Span TestSecondary8 weeks Continuous Performance TestSecondary8 weeks
NCT07569120	Start2026	PhaseNot applicable	ConditionsParkinson's disease, Healthy volunteers, Aging, frailty and exercise	Participants165	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary2 days Verbal FluencySecondary2 days Digit Span TestSecondary2 days Category FluencySecondary2 days Tower PlanningSecondary2 days
NCT07556250	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants225	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary1 week Stroop Color-Word TestPrimary2 weeks Verbal FluencySecondary1 week Digit Span TestPrimary1 week Card Sorting Test (Berg)Primary1 week Task Switching TestPrimary1 week Matrix ReasoningSecondary2 weeks Delay DiscountingSecondary2 weeks Tower PlanningSecondary1 week Iowa Gambling LiteSecondary1 week Probabilistic Reversal LearningPrimary1 week One-Touch Tower PlanningSecondary1 week Intra/Extra Dimensional Set ShiftPrimary1 week Betting Choice TaskSecondary1 week Alternative Uses TaskSecondary1 week Social Value OrientationSecondary2 weeks Remote Associates TestSecondary1 week Repeated Prisoner's DilemmaSecondary2 weeks Ellsberg Urns TaskSecondary2 weeks
NCT07494149	Start2026	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants158	Lead sponsorOther	StatusRecruiting	Library tests named Digit Span TestPrimary4 months Card Sorting Test (Berg)Primary4 months Corsi Block-Tapping TestPrimary4 months
NCT07443904	Start2026	PhaseNot applicable	ConditionsHealthy volunteers	Participants297	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary12 weeks Stroop Color-Word TestPrimary12 weeks Digit Span TestPrimary12 weeks
NCT07443189	Start2021	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants233	Lead sponsorOther	StatusCompleted Paper	Library tests named Digit Span TestPrimary6 months N-Back TaskPrimary6 months Continuous Performance TestPrimary6 months Picture Naming TestPrimary6 months Eriksen Flanker TaskPrimary6 months Task Switching TestPrimary6 months AX Continuous Performance TestWording unclear Attention Network TestPrimary6 months Posner CueingPrimary6 months
NCT07379164	Start2025	PhaseNot applicable	ConditionsHealthy volunteers, Pain and fatigue	Participants80	Lead sponsorOther	StatusCompleted	Library tests named Digit Span TestSecondarysame day
NCT07258433	Start2025	PhaseNot applicable	ConditionsHealthy volunteers, Sleep and sleep disorders	Participants120	Lead sponsorIndustry	StatusCompleted	Library tests named Digit Span TestSecondary6 weeks
NCT07208279	Start2025	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants16	Lead sponsorOther	StatusRecruiting	Library tests named Verbal LearningPrimary6 weeks Digit Span TestPrimary6 weeks Symbol CodingPrimary6 weeks
NCT07144930	Start2025	PhaseNot applicable	ConditionsStroke, Healthy volunteers	Participants210	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary4 months Stroop Color-Word TestPrimary4 months Digit Span TestPrimary4 months Task Switching TestPrimary4 months
NCT07132281	Start2025	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants120	Lead sponsorOther	StatusRecruiting	Library tests named Digit Span TestPrimary12 weeks Card Sorting Test (Berg)Primary12 weeks Task Switching TestPrimary12 weeks Short Story RecallPrimary12 weeks Matrix ReasoningPrimary12 weeks Remote Associates TestPrimary12 weeks
NCT07039708	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Healthy volunteers, Aging, frailty and exercise	Participants60	Lead sponsorOther	StatusStopped early	Library tests named Verbal FluencySecondary9 weeks Digit Span TestSecondary9 weeks
NCT06816667	Start2024	PhasePhase 1/2	ConditionsDepression and bipolar disorder, Healthy volunteers, Anxiety, PTSD and OCD	Participants40	Lead sponsorIndustry	StatusCompleted Paper	Library tests named Verbal FluencySecondary5 weeks Digit Span TestSecondary5 weeks Paced Visual Serial Addition TestSecondary5 weeks
NCT06616285	Start2024	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants80	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestSecondary6 months Stroop Color-Word TestSecondary6 months Verbal FluencySecondary6 months Digit Span TestSecondary6 months Symbol CodingSecondary6 months Probabilistic Reversal LearningSecondary6 months Effort Discounting TaskSecondary6 months
NCT06588920	Start2024	PhaseObservational	ConditionsParkinson's disease, Healthy volunteers, Aging, frailty and exercise	Participants70	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimarysame day Stroop Color-Word TestPrimarysame day Digit Span TestPrimarysame day Go/No-Go TaskPrimarysame day
NCT06425679	Start2023	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants120	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestPrimary11 months Stroop Color-Word TestSecondary11 months Digit Span TestSecondary11 months Symbol CodingSecondary11 months Clock Drawing TaskSecondary11 months
NCT06412887	Start2023	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants24	Lead sponsorOther	StatusCompleted	Library tests named Digit Span TestSecondarysame day
NCT06240286	Start2015	PhaseNot applicable	ConditionsHealthy volunteers	Participants44	Lead sponsorOther	StatusCompleted Paper	Library tests named Stroop Color-Word TestPrimary4 days Digit Span TestPrimary4 days Paired Associate LearningPrimary4 days Letter Pair Reasoning TaskPrimary4 days
NCT06090942	Start2023	PhaseNot applicable	ConditionsHealthy volunteers, Aging, frailty and exercise	Participants90	Lead sponsorOther	StatusStatus unknown	Library tests named Stroop Color-Word TestSecondary6 months Digit Span TestSecondary6 months Card Sorting Test (Berg)Secondary6 months

Questions, answered from the data

How many healthy volunteer trials use the Digit Span Test?

Which tests do healthy volunteer trials use with the Digit Span Test?

The Stroop Color-Word Test (20 studies), the Trail Making Test (19 studies) and Verbal Fluency (11 studies).

When do healthy volunteer trials measure the Digit Span Test?

Half of the primary outcomes that name the Digit Span Test are measured within 6 weeks of the start, and the middle half from 1 week to 4 months. 28 primary outcomes give a duration.

How many completed healthy volunteer trials that use the Digit Span Test have reported results?

How the studies are counted

Run the Digit Span Test in your trial

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Digit Span Test in healthy volunteer trials: 64 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When healthy volunteer 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 64 studies

Library tests named most

Conditions

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many healthy volunteer trials use the Digit Span Test?

Which tests do healthy volunteer trials use with the Digit Span Test?

When do healthy volunteer trials measure the Digit Span Test?

How many completed healthy volunteer trials that use the Digit Span Test have reported results?

More on the Digit Span Test and healthy volunteers

The Digit Span Test in other conditions

Other tests in healthy volunteer trials

How the studies are counted

Run the Digit Span Test in your trial

Digit Span Test in healthy volunteer trials: 64 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When healthy volunteer 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 64 studies

Library tests named most

Conditions

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many healthy volunteer trials use the Digit Span Test?

Which tests do healthy volunteer trials use with the Digit Span Test?

When do healthy volunteer trials measure the Digit Span Test?

How many completed healthy volunteer trials that use the Digit Span Test have reported results?

More on the Digit Span Test and healthy volunteers

The Digit Span Test in other conditions

Other tests in healthy volunteer trials

How the studies are counted

Run the Digit Span Test in your trial