Comparison · NCT02646423-d8912bd7
Prior CD Decision App (PCDDA) vs Usual Care - No App: Number of Participants Who Underwent Vaginal Birth After Cesarean (VBAC)
Calculated by ConductScience from the counts the trial posted to ClinicalTrials.gov.
2 sourcestrial-comparisons-2026-03-23-0.1.0
Cite this record
ConductScience Library. Prior CD Decision App (PCDDA) vs Usual Care - No App: Number of Participants Who Underwent Vaginal Birth After Cesarean (VBAC). Trial comparisons, record NCT02646423-d8912bd7. Release trial-comparisons-2026-03-23-0.1.0, 23 Mar 2026. https://conductscience.org/library/comparisons/NCT02646423-d8912bd7
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Measures6
Calculated by ConductScience from the counts the trial posted to ClinicalTrials.gov.
| Measure | Value | 95% interval, lower | 95% interval, upper | Method | Note |
|---|---|---|---|---|---|
| Risk in group 1 | 0.318 | 0.285 | 0.352 | wilson | |
| Risk in group 2 | 0.318 | 0.286 | 0.353 | wilson | |
| Risk difference, group 1 minus group 2 | -0.000562 | -0.0483 | 0.0472 | newcombe hybrid score | |
| Risk ratio, group 1 over group 2 | 0.998 | 0.859 | 1.16 | log | |
| Odds ratio, group 1 over group 2 | 0.997 | 0.8 | 1.24 | log | |
| Number needed to treat, for one fewer participant with the outcome on Prior CD Decision App (PCDDA) than on Usual Care - No App | 1,780 | from the risk difference interval | the interval includes no difference |
Source ClinicalTrials.gov
Groups2
Group 2 names the comparator: usual care.
| Group | Title | Description | With the outcome | Analysed | ClinicalTrials.gov code |
|---|---|---|---|---|---|
| Group 1 | Prior CD Decision App (PCDDA) | Women who are randomized to PCDDA will be provided access to a tablet which they can use to view the Prior CD Decision App at their own pace. The research assistant will print a summary of the participant's predicted likelihood of a vaginal delivery (VBAC) if she undergoes a trial of labor (TOLAC), as well as her answers to the values clarification exercises, that she can review and share with whomever she chooses, including her provider. | 231 | 727 | OG000 |
| Group 2 | Usual Care - No App | Women randomized to the Usual Care - No App group will simply continue with usual care. | 233 | 732 | OG001 |
Source ClinicalTrials.gov
Outcome
- Type
- SECONDARY
- Title
- Number of Participants Who Underwent Vaginal Birth After Cesarean (VBAC)
- Description
- Number of participants who underwent vaginal birth after cesarean (VBAC), as noted in the medical record.
- Time frame
- 0 to 8 weeks after delivery
- Population
Prior CD Decision App (PCDDA): no data available for N=8 participants who delivered at outside institution and no chart or outside questionnaire obtained.~Usual Care - No App: no data available for N=3 participants who delivered at outside institution and no chart or outside questionnaire obtained.
Source ClinicalTrials.gov
Trial
- Title
- Effect of a Patient-Centered Decision App on TOLAC
- NCT number
- NCT02646423
- Phases
- NA
- Conditions
- Pregnancy, Repeat Cesarean Section, Vaginal Births After Cesarean
- Interventions
- Prior CD Decision App
- Lead sponsor
- University of California, San Francisco
- Results first posted
- 2021-02-02
- Results on ClinicalTrials.gov
- https://clinicaltrials.gov/study/NCT02646423?tab=results
Source ClinicalTrials.gov
Source
- Release
- trial-comparisons-2026-03-23-0.1.0
- Release manifest SHA-256
- f66225897fbf258b57ea10bdacfd0347d3cdfda93f7f5685234b7e06ea36fa57
- AACT copy
- 2026-03-23
- Tables read
- outcome_counts.parquet, outcome_measurements.parquet, outcomes.parquet, reported_event_totals.parquet, reported_events.parquet, result_groups.parquet, studies.parquet, ctgov_trial.parquet
Source ClinicalTrials.gov
Sources 2
- ClinicalTrials.gov's posted results, through CTTI's AACTFreely available. Acknowledgement requested
- ClinicalTrials.govNo license stated
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
ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions. The measures are ConductScience's calculation from them.
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