Comparison · NCT00539539-ffc34b3e
Feedback On vs Feedback Off: Pulses Present at ED Arrival.
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. Feedback On vs Feedback Off: Pulses Present at ED Arrival. Trial comparisons, record NCT00539539-ffc34b3e. Release trial-comparisons-2026-03-23-0.1.0, 23 Mar 2026. https://conductscience.org/library/comparisons/NCT00539539-ffc34b3e
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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 | 0.319 | 0.288 | 0.352 | wilson | |
| Risk in group 2 | 0.315 | 0.283 | 0.349 | wilson | |
| Risk difference, group 1 minus group 2 | 0.00384 | -0.042 | 0.0495 | newcombe hybrid score | |
| Risk ratio, group 1 over group 2 | 1.01 | 0.876 | 1.17 | log | |
| Odds ratio, group 1 over group 2 | 1.02 | 0.824 | 1.26 | log | |
| Number needed to treat, for one more participant with the outcome on Feedback On than on Feedback Off | 260 | from the risk difference interval | the interval includes no difference |
Source ClinicalTrials.gov
Groups2
Neither group, or both, names a comparator, so the groups keep ClinicalTrials.gov's order.
| Group | Title | Description | With the outcome | Analysed | ClinicalTrials.gov code |
|---|---|---|---|---|---|
| Group 1 | Feedback On | Automated real-time feedback on CPR Process activated | 260 | 815 | OG000 |
| Group 2 | Feedback Off | For the first three to six months, participating EMS agencies will have defibrillators with automated, real-time feedback inactivated. During this period, the baseline rate of ROSC (and secondary outcomes) will be collected. At the end of this baseline period, EMS agencies will be randomized to one of two interventions, with randomization stratified within site by agency, station, or device. All clusters will cross-over to the opposite feedback strategy at least once during the intervention phase. | 243 | 771 | OG001 |
Source ClinicalTrials.gov
Outcome
- Type
- SECONDARY
- Title
- Pulses Present at ED Arrival.
- Description
- Time frame
- Resuscitation
- Population
- Intention to treat. Presence of pulses not known for one participant on the feedback off arm. Analysis includes 815 participants on the feedback on arm and 770 on the feedback off arm.
Source ClinicalTrials.gov
Trial
- Title
- Automated Real-time Feedback on CPR Study
- NCT number
- NCT00539539
- Phases
- PHASE2
- Conditions
- Heart Arrest
- Interventions
- Laerdal Q-CPR /technology
- Lead sponsor
- University of Washington
- Results first posted
- 2012-06-25
- Results on ClinicalTrials.gov
- https://clinicaltrials.gov/study/NCT00539539?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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