Clinical trials data
Stroop Color-Word Test in substance use and addiction trials: 75 registered studies
Every registered substance use and addiction 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 substance use and addiction studies name it in an outcome measure
- 75
- Name it in a primary outcome, 35%
- 26 of 75
Tests named in the same studies
- 1
Trail Making Test15 studies, 6 as a primary outcome
- 2
Card Sorting Test (Berg)11 studies, 5 as a primary outcome
- 3
Go/No-Go Task11 studies, 3 as a primary outcome
- 4
Stop-Signal Task10 studies, 6 as a primary outcome
- 5
Digit Span Test10 studies, 5 as a primary outcome
- 6
Verbal Fluency8 studies, 3 as a primary outcome
- 7
Symbol Coding8 studies, 2 as a primary outcome
- 8
Verbal Learning7 studies, 3 as a primary outcome
- 9
Emotional Stroop Task6 studies, 5 as a primary outcome
- 10
Delay Discounting6 studies, 2 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 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 2 | 0 |
| 2008 | 3 | 1 |
| 2009 | 0 | 0 |
| 2010 | 2 | 1 |
| 2011 | 5 | 2 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 4 | 1 |
| 2016 | 7 | 3 |
| 2017 | 4 | 2 |
| 2018 | 5 | 1 |
| 2019 | 6 | 4 |
| 2020 | 5 | 3 |
| 2021 | 3 | 0 |
| 2022 | 5 | 1 |
| 2023 | 6 | 2 |
| 2024 | 9 | 2 |
| 2025 | 3 | 0 |
| 2026 | 4 | 3 |
Phases and study sizes
By phase
- Early phase 12 studies, 0 as a primary outcome
- Phase 14 studies, 2 as a primary outcome
- Phase 1/23 studies, 1 as a primary outcome
- Phase 29 studies, 4 as a primary outcome
- Phase 2/31 studies, 0 as a primary outcome
- Phase 32 studies, 0 as a primary outcome
- Phase 43 studies, 0 as a primary outcome
- Not applicable41 studies, 15 as a primary outcome
- Observational10 studies, 4 as a primary outcome
Participants per study
- Not applicable60 median, 38 to 93
- Observational156 median, 107 to 294
Show as a table
| Phase | Studies with a size | Median | Middle half |
|---|---|---|---|
| Not applicable | 41 | 60 | 38 to 93 |
| Observational | 10 | 156 | 107 to 294 |
When substance use and addiction trials measure it
Latest time point of each outcome
- Within a day14 outcomes, 6 as a primary outcome
- Up to 4 weeks26 outcomes, 11 as a primary outcome
- 1 to 3 months18 outcomes, 5 as a primary outcome
- 3 to 6 months6 outcomes, 1 as a primary outcome
- 6 to 12 months4 outcomes, 0 as a primary outcome
- 1 to 2 years1 outcomes, 0 as a primary outcome
- Over 2 years1 outcomes, 0 as a primary outcome
- No duration given5 outcomes, 3 as a primary outcome
A test as a primary outcomeOnly in secondary or other outcomes
70 of the 75 outcome measures give a duration. A single visit counts as within a day.
Status, results, interventions and countries
Status
- Recruiting14 studies, 5 as a primary outcome
- Not yet recruiting4 studies, 1 as a primary outcome
- Active, not recruiting5 studies, 1 as a primary outcome
- Completed35 studies, 11 as a primary outcome
- Stopped early6 studies, 5 as a primary outcome
- Status unknown11 studies, 3 as a primary outcome
What they test
- Behavioral20 studies, 9 as a primary outcome
- Drug29 studies, 10 as a primary outcome
- Device16 studies, 7 as a primary outcome
- Procedure2 studies, 0 as a primary outcome
- Diagnostic test4 studies, 1 as a primary outcome
- Biological1 studies, 1 as a primary outcome
- Other14 studies, 5 as a primary outcome
- None given2 studies, 1 as a primary outcome
Intervention types as registered. A study can list several; observational studies often list none.
Where their sites are
- United States36 studies, 16 as a primary outcome
- France7 studies, 1 as a primary outcome
- Germany4 studies, 2 as a primary outcome
- Australia3 studies, 0 as a primary outcome
- Türkiye3 studies, 1 as a primary outcome
- United Kingdom3 studies, 1 as a primary outcome
- Brazil2 studies, 1 as a primary outcome
- Israel2 studies, 0 as a primary outcome
- Belgium1 studies, 0 as a primary outcome
- Canada1 studies, 0 as a primary outcome
- China1 studies, 0 as a primary outcome
- Czechia1 studies, 0 as a primary outcome
19 countries in all. A study with sites in several counts in each; 4 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 substance use and addiction studies that name the Stroop Color-Word Test: 18 of 35, 51%
Every completed study with a cognitive outcome: 3,626 of 7,953, 46%
| Results | Completed substance use and addiction studies that name the Stroop Color-Word Test | Every completed study |
|---|---|---|
| Results on ClinicalTrials.gov and a paper | 4, 11% | 776, 10% |
| Results on ClinicalTrials.gov only | 8, 23% | 1,139, 14% |
| A results paper only | 6, 17% | 1,711, 22% |
| Neither | 17, 49% | 4,327, 54% |
The 75 studies
75 studies match. 26 name the Stroop Color-Word Test in a primary outcome. Median size 60 participants. Median time to the primary outcome: 3 weeks.
Loading 75 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 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 2 | 0 |
| 2008 | 3 | 1 |
| 2009 | 0 | 0 |
| 2010 | 2 | 1 |
| 2011 | 5 | 2 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 4 | 1 |
| 2016 | 7 | 3 |
| 2017 | 4 | 2 |
| 2018 | 5 | 1 |
| 2019 | 6 | 4 |
| 2020 | 5 | 3 |
| 2021 | 3 | 0 |
| 2022 | 5 | 1 |
| 2023 | 6 | 2 |
| 2024 | 9 | 2 |
| 2025 | 3 | 0 |
| 2026 | 4 | 3 |
Library tests named most
Conditions
Phases
Participants
Lead sponsor: industry 6, NIH 1, other 68. Interventional 65, observational 10.
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 |
|---|---|---|---|---|---|---|---|
| NCT07296874 | Start2026 | PhasePhase 1 | ConditionsSubstance use and addiction | Participants92 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07247370 | Start2025 | PhasePhase 1/2 | ConditionsDepression and bipolar disorder, Substance use and addiction | Participants20 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT07160153 | Start2024 | PhaseObservational | ConditionsSubstance use and addiction | Participants29 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT07033416 | Start2026 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants60 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06954402 | Start2026 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants125 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06933186 | Start2024 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants48 | Lead sponsorOther | StatusActive, not recruiting | Library tests named
|
| NCT06899594 | Start2025 | PhaseEarly phase 1 | ConditionsSubstance use and addiction | Participants20 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06888700 | Start2025 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants84 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06805968 | Start2023 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants30 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT06701500 | Start2024 | PhaseObservational | ConditionsSubstance use and addiction | Participants180 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06636929 | Start2024 | PhaseObservational | ConditionsSubstance use and addiction | Participants131 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT06387719 | Start2023 | PhaseObservational | ConditionsObesity and diabetes, Substance use and addiction | Participants102 | Lead sponsorOther | StatusStatus unknown | Library tests named
|
| NCT06286774 | Start2024 | PhaseNot applicable | ConditionsSubstance use and addiction, Sleep and sleep disorders | Participants256 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT06081218 | Start2024 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants60 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT05997212 | Start2024 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants44 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT05992272 | Start2020 | PhaseObservational | ConditionsSubstance use and addiction | Participants300 | Lead sponsorOther | StatusStatus unknown | Library tests named
|
| NCT05784961 | Start2024 | PhaseNot applicable | ConditionsSchizophrenia and psychosis, Substance use and addiction | Participants138 | Lead sponsorOther | StatusNot yet recruiting | Library tests named
|
| NCT05740358 | Start2022 | PhaseObservational | ConditionsSubstance use and addiction | Participants1,222 | Lead sponsorOther | StatusActive, not recruiting | Library tests named
|
| NCT05568251 | Start2019 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants38 | Lead sponsorOther | StatusCompleted | Library tests named
|
| NCT05548452 | Start2022 | PhasePhase 1/2 | ConditionsSubstance use and addiction | Participants80 | Lead sponsorOther | StatusActive, not recruiting | Library tests named
|
| NCT05538910 | Start2023 | PhaseNot applicable | ConditionsDepression and bipolar disorder, Substance use and addiction | Participants620 | Lead sponsorNIH | StatusRecruiting | Library tests named
|
| NCT05437809 | Start2023 | PhaseNot applicable | ConditionsObesity and diabetes, Substance use and addiction | Participants50 | Lead sponsorOther | StatusActive, not recruiting | Library tests named
|
| NCT05408247 | Start2023 | PhasePhase 4 | ConditionsSubstance use and addiction | Participants280 | Lead sponsorOther | StatusRecruiting | Library tests named
|
| NCT05387148 | Start2022 | PhasePhase 2 | ConditionsSubstance use and addiction | Participants20 | Lead sponsorOther | StatusStatus unknown | Library tests named
|
| NCT05324085 | Start2022 | PhaseNot applicable | ConditionsSubstance use and addiction | Participants84 | Lead sponsorOther | StatusCompleted | Library tests named
|
Questions, answered from the data
How many substance use and addiction trials use the Stroop Color-Word Test?
75 registered substance use and addiction studies on ClinicalTrials.gov name it in an outcome measure, 26 of them in a primary outcome: 8% of the condition's 895 studies with a cognitive outcome, against 12% of all of them. It is the 7th most named test in substance use and addiction trials.
Which tests do substance use and addiction trials use with the Stroop Color-Word Test?
The Trail Making Test (15 studies), the Card Sorting Test (Berg) (11 studies) and the Go/No-Go Task (11 studies).
When do substance use and addiction trials measure the Stroop Color-Word Test?
Half of the primary outcomes that name the Stroop Color-Word Test are measured within 3 weeks of the start, and the middle half from 1 week to 6 weeks. 23 primary outcomes give a duration.
How many completed substance use and addiction trials that use the Stroop Color-Word Test have reported results?
18 of the 35 completed studies that name it, 51%, have reported results: 12 posted them on ClinicalTrials.gov, 10 have a results paper linked to the registry record, and 4 did both. The other 17 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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