The Effect of Tablet Size on Cognitive Performance Caffeine
NCT03694886, Phase 4, Completed, University of Colorado, Denver
Trial 10
As registered on ClinicalTrials.gov, in the graph's capture of the registry.
| Field | Value | Source |
|---|---|---|
| Title | The Effect of Tablet Size on Cognitive Performance Caffeine | ClinicalTrials.gov |
| NCT number | NCT03694886 | ClinicalTrials.gov |
| Status | Completed | ClinicalTrials.gov |
| Phases | Phase 4 | ClinicalTrials.gov |
| Enrollment | 120 participants, actual | ClinicalTrials.gov |
| Lead sponsor | University of Colorado, Denver | ClinicalTrials.gov |
| Conditions | Placebo Effect | ClinicalTrials.gov |
| Interventions | Caffeine Anhydrous with small sucrose pill, Placebo - large sucrose pill, Caffeine Anhydrous with large sucrose pill, Placebo - small sucrose pill | ClinicalTrials.gov |
| First posted | 2018-10-03 | ClinicalTrials.gov |
| Last updated | 2019-04-17 | ClinicalTrials.gov |
Registered outcomes 6
Each outcome the trial registered, primary first, in ClinicalTrials.gov's words.
| List | Outcome | Time frame | Description | Source |
|---|---|---|---|---|
| Primary | Stroop Color test | Within 90 minutes of receiving informed consent. Actual task time: approximately 1.5 minutes | Measures processing speed. 100-item, time-trial task where participants read the color of printed items on the task paper as quickly as possible for 45 seconds. Scores are measured in the number of correct responses within the allotted time. | ClinicalTrials.gov |
| Primary | Stroop Word test | Within 90 minutes of receiving informed consent. Actual task time: approximately 1.5 minutes | Measures processing speed. 100-item, time-trial task where participants read color names printed on the task paper as quickly as possible for 45 seconds. Scores are measured in the number of correct responses within the allotted time. | ClinicalTrials.gov |
| Primary | Trail Making task A | Within 90 minutes of receiving informed consent. Actual task time: approximately 2 minutes | Measures processing speed. 25 item, time-trial task where participants must connect numbers in order as quickly as possible. Scores are measured by the amount of time (in seconds) for participants to complete the task. | ClinicalTrials.gov |
| Secondary | Stroop Color-and-Word test | Within 90 minutes of receiving informed consent. Actual task time: approximately 2 minutes | Measures processing speed. 100-item, time-trial task where participants must read the color of the ink instead of color names printed on the task paper as quickly as possible for 45 seconds. Scores are measured in the number of correct responses within the allotted time. | ClinicalTrials.gov |
| Secondary | Trail Making task B | Within 90 minutes of receiving informed consent. Actual task time: approximately 3 minutes | Measures processing speed. 25 item, time-trial task where participants must connect numbers and letters in order (e.g. 1-A-2-B, etc.) as quickly as possible. Scores are measured by the amount of time (in seconds) for participants to complete the task. | ClinicalTrials.gov |
| Secondary | Rey Auditory Verbal Learning test | Within 90 minutes of receiving informed consent. Actual task time: approximately 40 minutes | Measures memory. 30-item, 2 section task where participants are read 15 words and asked to recall as many words as possible in the first section. A second set of 15 words is then introduced and participants recall those. The second section consists of revisiting the original set of words and recalling as many of those. Scores are measured by the total words remembered in section one, and another score for the total intrusions from the second list into the recall of section two. | ClinicalTrials.gov |
Outcomes 0
Each outcome the trial posted results for, in ClinicalTrials.gov's words.
| Type | Outcome | Time frame | Population | Units | Measured as | Source |
|---|
Results by group 0
Each measurement the trial posted, group by group, in the words and numbers it posted.
| Outcome | Group | Category | Value | Spread | Units | Source |
|---|
Participant flow 0
How many started, completed or left each group, period by period.
| Period | Milestone | Group | Participants | Units counted | Source |
|---|
Adverse events 0
Each adverse event the trial posted, group by group: the participants affected out of those at risk.
| Type | Event | Organ system | Group | Affected | At risk | Events | Source |
|---|
Adverse event totals 0
The totals the trial posted for each group.
| Total | Group | Affected | At risk | Source |
|---|
Papers 16
The papers the trial lists on ClinicalTrials.gov.
| PMID | Listed as | Source |
|---|---|---|
| 1356551 | BACKGROUND | PubMed |
| 7119132 | BACKGROUND | PubMed |
| 11721676 | BACKGROUND | PubMed |
| 14589618 | BACKGROUND | PubMed |
| 15089805 | BACKGROUND | PubMed |
| 17853128 | BACKGROUND | PubMed |
| 21500050 | BACKGROUND | PubMed |
| 22608298 | BACKGROUND | PubMed |
| 22744843 | BACKGROUND | PubMed |
| 24665818 | BACKGROUND | PubMed |
| 24788599 | BACKGROUND | PubMed |
| 27236788 | BACKGROUND | PubMed |
| 27762662 | BACKGROUND | PubMed |
| 28399689 | BACKGROUND | PubMed |
| 28882811 | BACKGROUND | PubMed |
| 42078734 | BACKGROUND | PubMed |
Grants 0
The grants NIH RePORTER links to the trial, newest funded first: NIH's, and some of AHRQ's, CDC's, FDA's and VA's. Each shows its title, principal investigators, organization and funder in its newest year.
| Project | Title | Principal investigators | Organization | Funder | Fiscal years | Source |
|---|
Trial comparisons 0
Comparisons of the trial's two groups, calculated by ConductScience from the counts it posted.
| Comparison | Source |
|---|
Tests 4
The ConductCognition tests this trial's registered outcomes name, as ScienceGraph matched them in trial-tests-2026-11-12-0.2.1.
| Test | Named as | Source |
|---|---|---|
| Stroop Color-Word Test | Primary outcome | ConductCognition |
| Trail Making Test A | Primary outcome | ConductCognition |
| Trail Making Test B | Primary outcome | ConductCognition |
| Verbal Learning | Secondary outcome | ConductCognition |
Source 5
| Field | Value | Source |
|---|---|---|
| Release | trials-2026-11-12-0.4.0 | ClinicalTrials.gov |
| Release manifest SHA-256 | 0f4a8d8c48aee2a7573ae0fa94ecbeab70c1adbe449bbc95c424bc7d3e97b9d4 | ClinicalTrials.gov |
| Registry capture | 2026-11-12 | ClinicalTrials.gov |
| Results copy, AACT | 2026-03-23 | ClinicalTrials.gov |
| NIH clinical studies file | 2026-11-13 | ClinicalTrials.gov |
Release trials-2026-11-12-0.4.0
ClinicalTrials.gov's posted results, through CTTI's AACT: ClinicalTrials.gov data via Aggregate Analysis of ClinicalTrials.gov (AACT), CTTI. CTTI makes its materials freely available and requests acknowledgement. https://aact.ctti-clinicaltrials.org/documentation/299 ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions.
ClinicalTrials.gov: none stated ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions.
NIH RePORTER's clinical studies and project files: Public domain (NIH RePORTER)