Clinical trials data
Stroop Color-Word Test in pain and fatigue trials: 114 registered studies
Every registered pain and fatigue 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 pain and fatigue studies name it in an outcome measure
- 114
- Name it in a primary outcome, 38%
- 43 of 114
Tests named in the same studies
- 1
Trail Making Test26 studies, 12 as a primary outcome
- 2
Verbal Fluency13 studies, 2 as a primary outcome
- 3
Digit Span Test12 studies, 6 as a primary outcome
- 4
Verbal Learning11 studies, 4 as a primary outcome
- 5
Psychomotor Vigilance Task10 studies, 5 as a primary outcome
- 6
Symbol Coding10 studies, 4 as a primary outcome
- 7
N-Back Task9 studies, 3 as a primary outcome
- 8
Go/No-Go Task9 studies, 2 as a primary outcome
- 9
Eriksen Flanker Task6 studies, 6 as a primary outcome
- 10
Card Sorting Test (Berg)6 studies, 1 as a primary outcome
A test as a primary outcomeOnly in secondary or other outcomes
Studies by start year
A test as a primary outcomeOnly in secondary or other outcomes
Show as a table
| Start year | Studies | A test as a primary outcome |
|---|---|---|
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 1 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 3 | 1 |
| 2014 | 1 | 0 |
| 2015 | 2 | 1 |
| 2016 | 0 | 0 |
| 2017 | 2 | 0 |
| 2018 | 6 | 2 |
| 2019 | 5 | 2 |
| 2020 | 5 | 3 |
| 2021 | 9 | 6 |
| 2022 | 10 | 3 |
| 2023 | 11 | 6 |
| 2024 | 16 | 8 |
| 2025 | 13 | 3 |
| 2026 | 24 | 7 |
Phases and study sizes
By phase
- Phase 12 studies, 1 as a primary outcome
- Phase 1/21 studies, 0 as a primary outcome
- Phase 25 studies, 1 as a primary outcome
- Phase 2/32 studies, 0 as a primary outcome
- Phase 32 studies, 1 as a primary outcome
- Phase 41 studies, 0 as a primary outcome
- Not applicable83 studies, 31 as a primary outcome
- Observational18 studies, 9 as a primary outcome
Participants per study
- Not applicable39 median, 23 to 95
- Observational97 median, 80 to 147
Show as a table
| Phase | Studies with a size | Median | Middle half |
|---|---|---|---|
| Not applicable | 82 | 39 | 23 to 95 |
| Observational | 18 | 97 | 80 to 147 |
When pain and fatigue trials measure it
Latest time point of each outcome
- Within a day24 outcomes, 9 as a primary outcome
- Up to 4 weeks22 outcomes, 11 as a primary outcome
- 1 to 3 months30 outcomes, 9 as a primary outcome
- 3 to 6 months8 outcomes, 2 as a primary outcome
- 6 to 12 months9 outcomes, 2 as a primary outcome
- 1 to 2 years3 outcomes, 1 as a primary outcome
- Over 2 years1 outcomes, 0 as a primary outcome
- No duration given17 outcomes, 9 as a primary outcome
A test as a primary outcomeOnly in secondary or other outcomes
97 of the 114 outcome measures give a duration. A single visit counts as within a day.
Status, results, interventions and countries
Status
- Recruiting25 studies, 9 as a primary outcome
- Not yet recruiting15 studies, 5 as a primary outcome
- Active, not recruiting2 studies, 0 as a primary outcome
- Completed52 studies, 19 as a primary outcome
- Stopped early3 studies, 2 as a primary outcome
- Status unknown17 studies, 8 as a primary outcome
What they test
- Behavioral25 studies, 5 as a primary outcome
- Drug13 studies, 4 as a primary outcome
- Device22 studies, 11 as a primary outcome
- Dietary supplement18 studies, 4 as a primary outcome
- Procedure4 studies, 1 as a primary outcome
- Diagnostic test3 studies, 2 as a primary outcome
- Biological1 studies, 0 as a primary outcome
- Radiation1 studies, 0 as a primary outcome
- Other34 studies, 15 as a primary outcome
- None given9 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 States28 studies, 11 as a primary outcome
- Belgium10 studies, 5 as a primary outcome
- Türkiye10 studies, 5 as a primary outcome
- Canada8 studies, 3 as a primary outcome
- United Kingdom6 studies, 3 as a primary outcome
- China5 studies, 2 as a primary outcome
- Italy4 studies, 2 as a primary outcome
- Spain4 studies, 0 as a primary outcome
- France3 studies, 0 as a primary outcome
- Norway3 studies, 0 as a primary outcome
- Poland3 studies, 1 as a primary outcome
- Switzerland3 studies, 1 as a primary outcome
32 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 pain and fatigue studies that name the Stroop Color-Word Test: 21 of 52, 40%
Every completed study with a cognitive outcome: 3,626 of 7,953, 46%
| Results | Completed pain and fatigue studies that name the Stroop Color-Word Test | Every completed study |
|---|---|---|
| Results on ClinicalTrials.gov and a paper | 3, 6% | 776, 10% |
| Results on ClinicalTrials.gov only | 4, 8% | 1,139, 14% |
| A results paper only | 14, 27% | 1,711, 22% |
| Neither | 31, 60% | 4,327, 54% |
The 114 studies
114 studies match. 43 name the Stroop Color-Word Test in a primary outcome. Median size 50 participants. Median time to the primary outcome: 2 weeks.
Loading 114 studies; the filters turn on when they arrive.
2026 is partly planned starts.
Show as a table
| Start year | Studies | As a primary outcome |
|---|---|---|
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 1 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 3 | 1 |
| 2014 | 1 | 0 |
| 2015 | 2 | 1 |
| 2016 | 0 | 0 |
| 2017 | 2 | 0 |
| 2018 | 6 | 2 |
| 2019 | 5 | 2 |
| 2020 | 5 | 3 |
| 2021 | 9 | 6 |
| 2022 | 10 | 3 |
| 2023 | 11 | 6 |
| 2024 | 16 | 8 |
| 2025 | 13 | 3 |
| 2026 | 24 | 7 |
Library tests named most
Largest condition groups
Phases
Participants
Lead sponsor: industry 5, other 109. Interventional 96, 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.
| Study | Start | Phase | Conditions | Participants | Lead sponsor | Status | Library tests named, with the latest time point |
|---|---|---|---|---|---|---|---|
| NCT07906847 | Start2026 | PhaseObservational | ConditionsPain and fatigue | Participants80 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07867041 | Start2024 | PhaseNot applicable | ConditionsPain and fatigue | Participants24 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT07851896 | Start2026 | PhaseNot applicable | ConditionsPain and fatigue | Participants40 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07842302 | Start2026 | PhaseNot applicable | ConditionsMultiple sclerosis, Pain and fatigue | Participants80 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07791355 | Start2026 | PhaseNot applicable | ConditionsPain and fatigue | Participants25 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07779304 | Start2026 | PhaseNot applicable | ConditionsPain and fatigue | Participants32 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07752329 | Start2026 | PhaseNot applicable | ConditionsPain and fatigue | Participants70 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07740967 | Start2026 | PhaseNot applicable | ConditionsSleep and sleep disorders, Pain and fatigue, Cardiovascular disease | Participants34 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07729930 | Start2026 | PhaseNot applicable | ConditionsSleep and sleep disorders, Pain and fatigue, Cardiovascular disease | Participants38 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07715838 | Start2024 | PhaseObservational | ConditionsPain and fatigue | Participants100 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07709234 | Start2026 | PhaseNot applicable | ConditionsCOVID-19 and long COVID, Pain and fatigue | Participants20 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07706283 | Start2025 | PhaseNot applicable | ConditionsHealthy volunteers, Sleep and sleep disorders, Pain and fatigue | Participants81 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT07691229 | Start2022 | PhaseNot applicable | ConditionsPain and fatigue | Participants24 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT07688564 | Start2026 | PhaseNot applicable | ConditionsObesity and diabetes, Pain and fatigue | Participants156 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07656519 | Start2026 | PhaseNot applicable | ConditionsAnxiety, PTSD and OCD, Pain and fatigue | Participants10 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07648667 | Start2026 | PhaseObservational | ConditionsPain and fatigue | Participants60 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07645404 | Start2026 | PhaseNot applicable | ConditionsPain and fatigue | Participants16 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07644611 | Start2026 | PhaseObservational | ConditionsSleep and sleep disorders, Pain and fatigue | Participants30 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07641335 | Start2026 | PhaseNot applicable | ConditionsPain and fatigue | Participants12 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07624084 | Start2025 | PhaseNot applicable | ConditionsPain and fatigue | Participants42 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT07615478 | Start2026 | PhaseNot applicable | ConditionsPain and fatigue | Participants27 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07604519 | Start2026 | PhaseNot applicable | ConditionsAging, frailty and exercise, Pain and fatigue | Participants97 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT07604077 | Start2026 | PhaseNot applicable | ConditionsPain and fatigue | Participants40 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07539116 | Start2024 | PhaseNot applicable | ConditionsPain and fatigue | Participants183 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT07497711 | Start2026 | PhasePhase 2/3 | ConditionsAging, frailty and exercise, Pain and fatigue | Participants145 | Lead sponsorOther | StatusRecruiting | Library tests named
|
Questions, answered from the data
How many pain and fatigue trials use the Stroop Color-Word Test?
114 registered pain and fatigue studies on ClinicalTrials.gov name it in an outcome measure, 43 of them in a primary outcome: 17% of the condition's 681 studies with a cognitive outcome, against 12% of all of them. It is the test pain and fatigue trials name most.
Which tests do pain and fatigue trials use with the Stroop Color-Word Test?
The Trail Making Test (26 studies), Verbal Fluency (13 studies) and the Digit Span Test (12 studies).
When do pain and fatigue trials measure the Stroop Color-Word Test?
Half of the primary outcomes that name the Stroop Color-Word Test are measured within 2 weeks of the start, and the middle half from the first day to 11 weeks. 34 primary outcomes give a duration.
How many completed pain and fatigue trials that use the Stroop Color-Word Test have reported results?
21 of the 52 completed studies that name it, 40%, have reported results: 7 posted them on ClinicalTrials.gov, 17 have a results paper linked to the registry record, and 3 did both. The other 31 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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