Trial · NCT01639443
Reducing VA No-Shows: Evaluation of Predictive Overbooking Applied to Colonoscopy
NCT01639443, Not applicable, Completed, VA Office of Research and Development; results first posted 2016-10-31
3 sourcestrials-2026-11-12-0.5.0
Cite this record
ConductScience Library. Reducing VA No-Shows: Evaluation of Predictive Overbooking Applied to Colonoscopy. Trials, record NCT01639443. Release trials-2026-11-12-0.5.0, 12 Nov 2026. https://conductscience.org/library/trials/NCT01639443
On this page
Trial
As registered on ClinicalTrials.gov, in the graph's capture of the registry.
- Title
- Reducing VA No-Shows: Evaluation of Predictive Overbooking Applied to Colonoscopy
- NCT number
- NCT01639443
- Status
- Completed
- Phases
- Not applicable
- Enrollment
- 180 participants, actual
- Lead sponsor
- VA Office of Research and Development
- Conditions
- Colon Cancer
- Interventions
- Predictive no-show overbooking
- First posted
- 2012-07-12
- Last updated
- 2018-04-12
- Results first posted
- 2016-10-31
- Limitations and caveats
This study was impeded by our ability to schedule Veterans into Fast-Tracked appointments. Although the method is very promising, integration of predictive scheduling is vital for this program to benefit Veterans on a large scale.
Source ClinicalTrials.gov
Registered outcomes6
Each outcome the trial registered, primary first, in ClinicalTrials.gov's words.
| List | Outcome | Time frame | Description |
|---|---|---|---|
| Primary | Percentage of GI Clinic Capacity Filled | After 12 months of running study in clinic | Investigators' primary objective will be to evaluate the impact of no-show predictive overbooking on percentage of the GI endoscopy clinic that are filled on a given day. Days where at least one Fast-tracked patient attended an appointment were compared to days where only Control patients attended appointments. Percentage of GI Clinic Capacity is calculated as the number of appointments completed divided by number of appointment spots available on a given day. This percentage was compared between Fast-tracked days and Control days, using data from 1672 patients. |
| Secondary | Scheduling-to-procedure Lag Time | After 12 months of running study in clinic | The investigators will calculate the mean daily lag time for all colonoscopy and upper endoscopies performed per day |
| Secondary | Daily Service Denials ("Bumps") | After 12 months of running study in clinic | The investigators will compare the number of patients bumped per day between scheduling approaches |
| Secondary | Advanced Adenoma Detection/Cecal Intubation Rates | After 20 months of running study in clinic | The investigators will compare daily advanced adenomatous polyp detection and daily cecal intubation rates between groups. |
| Secondary | Length of Workday | After 12 months of running study in clinic | Length of Workday in hours (comparing days with Fast-Tracked Appointments to Control days without) |
| Secondary | Cost Comparisons | After 12 months of running study in clinic | For cost comparisons, the investigators will aggregate total provider overtime costs for colonoscopies performed. Cost is reported per day. |
Source ClinicalTrials.gov
Outcomes6
Each outcome the trial posted results for, in ClinicalTrials.gov's words.
| Type | Outcome | Time frame | Population | Units | Measured as |
|---|---|---|---|---|---|
| PRIMARY | Percentage of GI Clinic Capacity Filled | After 12 months of running study in clinic | These 1672 patients are a subset of all patients who were enrolled in this study. We dropped data on a first wave of participants (69 Fast-tracked and 3294 Controls) because of problems incorporating recruitment strategy into clinic. However, data from these individuals was used to build predictive model. | percentage of clinic capacity filled | MEAN |
| SECONDARY | Scheduling-to-procedure Lag Time | After 12 months of running study in clinic | These 1672 patients are a subset of all patients who were enrolled in this study. We dropped data on a first wave of participants (69 Fast-tracked and 3294 Controls) because of problems incorporating recruitment strategy into clinic. However, data from these individuals was used to build predictive model. | days | MEAN |
| SECONDARY | Daily Service Denials (Bumps) | After 12 months of running study in clinic | These 1672 patients are a subset of all patients who were enrolled in this study. We dropped data on a first wave of participants (69 Fast-tracked and 3294 Controls) because of problems incorporating recruitment strategy into clinic. However, data from these individuals was used to build predictive model. | participants | NUMBER |
| SECONDARY | Advanced Adenoma Detection/Cecal Intubation Rates | After 20 months of running study in clinic | We only collected data on polyp detection for the first half of our Fast-tracked participants and all Controls seen over the same time period (4897 in total). | Number of Polyps Detected per patient | MEAN |
| SECONDARY | Length of Workday | After 12 months of running study in clinic | These 1672 patients are a subset of all patients who were enrolled in this study. We dropped data on a first wave of participants (69 Fast-tracked and 3294 Controls) because of problems incorporating recruitment strategy into clinic. However, data from these individuals was used to build predictive model. | hours | MEAN |
| SECONDARY | Cost Comparisons | After 12 months of running study in clinic | These 1672 patients are a subset of all patients who were enrolled in this study. We dropped data on a first wave of participants (69 Fast-tracked and 3294 Controls) because of problems incorporating recruitment strategy into clinic. However, data from these individuals was used to build predictive model. | dollars | MEAN |
Source ClinicalTrials.gov
Results by group12
Each measurement the trial posted, group by group, in the words and numbers it posted.
| Outcome | Group | Category | Value | Spread | Units |
|---|---|---|---|---|---|
| Percentage of GI Clinic Capacity Filled | Fast-tracked | 99.6 | Standard Deviation 19.4 | percentage of clinic capacity filled | |
| Percentage of GI Clinic Capacity Filled | Control | 86.4 | Standard Deviation 21.6 | percentage of clinic capacity filled | |
| Scheduling-to-procedure Lag Time | Fast-tracked | 8.3 | Standard Deviation 24.3 | days | |
| Scheduling-to-procedure Lag Time | Control | 10.8 | Standard Deviation 24.0 | days | |
| Daily Service Denials (Bumps) | Fast-tracked | 0 | participants | ||
| Daily Service Denials (Bumps) | Control | 29 | participants | ||
| Advanced Adenoma Detection/Cecal Intubation Rates | Fast-tracked | 2.35 | Standard Deviation 1.58 | Number of Polyps Detected per patient | |
| Advanced Adenoma Detection/Cecal Intubation Rates | Control | 2.88 | Standard Deviation 2.56 | Number of Polyps Detected per patient | |
| Length of Workday | Fast-tracked | 8.31 | Standard Deviation 1.32 | hours | |
| Length of Workday | Control | 7.84 | Standard Deviation 1.32 | hours |
1 to 10 of 12Source ClinicalTrials.gov
See all 12 results by groupParticipant flow6
How many started, completed or left each group, period by period.
| Period | Milestone | Group | Participants | Units counted |
|---|---|---|---|---|
| Overall Study | STARTED | Fast-tracked | 180 | |
| Overall Study | STARTED | Control | 4,855 | |
| Overall Study | COMPLETED | Fast-tracked | 180 | |
| Overall Study | COMPLETED | Control | 4,855 | |
| Overall Study | NOT COMPLETED | Fast-tracked | 0 | |
| Overall Study | NOT COMPLETED | Control | 0 |
Source ClinicalTrials.gov
Adverse events0
Each adverse event the trial posted, group by group: the participants affected out of those at risk.
None in this release.
Adverse event totals6
The totals the trial posted for each group.
| Total | Group | Affected | At risk |
|---|---|---|---|
| Total, all-cause mortality | Fast-tracked | ||
| Total, all-cause mortality | Control | ||
| Total, other adverse events | Fast-tracked | 0 | 180 |
| Total, other adverse events | Control | 0 | 4,855 |
| Total, serious adverse events | Fast-tracked | 0 | 180 |
| Total, serious adverse events | Control | 0 | 4,855 |
Source ClinicalTrials.gov
Papers3
The papers the trial lists on ClinicalTrials.gov.
Grants1
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 |
|---|---|---|---|---|---|
| I01HX000878 | Reducing VA No-Shows: Evaluation of Predictive Overbooking Applied to Colonoscopy | SPIEGEL, BRENNAN MASON ROSS | VA GREATER LOS ANGELES HEALTHCARE SYSTEM | Veterans Affairs | 2013 to 2015 |
Source NIH RePORTER
Trial comparisons2
Comparisons of the trial's two groups, calculated by ConductScience from the counts it posted.
| Comparison | Source |
|---|---|
| Fast-tracked vs Control: Daily Service Denials (Bumps) | Trial comparisons |
| Fast-tracked vs Control: serious adverse events | Trial comparisons |
Tests0
The ConductCognition tests this trial's registered outcomes name, as ScienceGraph matched them in trial-tests-2026-11-12-0.2.1.
None in this release.
Data dates
The day each source was copied for this release.
Sources 3
- ClinicalTrials.gov's posted results, through CTTI's AACTFreely available. Acknowledgement requested
- ClinicalTrials.govNo license stated
- NIH RePORTER's clinical studies and project filesPublic domain
Each source's terms
- ClinicalTrials.gov's posted results, through CTTI's AACTClinicalTrials.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.govnone stated
- NIH RePORTER's clinical studies and project filesPublic domain (NIH RePORTER)
ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions.
For software
Read this trial from software.
The record and each of its lists are JSON, twenty rows a page. No key.
GET https://conductscience.org/api/trials/v1/NCT01639443
GET https://conductscience.org/api/trials/v1/NCT01639443/registered