Comparison · NCT01643616-bc5de8b1
Group US vs Group NS: Success Rate Without Supplementation
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. Group US vs Group NS: Success Rate Without Supplementation. Trial comparisons, record NCT01643616-bc5de8b1. Release trial-comparisons-2026-03-23-0.1.0, 23 Mar 2026. https://conductscience.org/library/comparisons/NCT01643616-bc5de8b1
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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 | 0.949 | 0.893 | 0.976 | wilson | |
| Risk in group 2 | 0.619 | 0.529 | 0.701 | wilson | |
| Risk difference, group 1 minus group 2 | 0.331 | 0.231 | 0.425 | newcombe hybrid score | |
| Risk ratio, group 1 over group 2 | 1.53 | 1.32 | 1.78 | log | |
| Odds ratio, group 1 over group 2 | 11.5 | 4.67 | 28.3 | log | |
| Number needed to treat, for one more participant with the outcome on Group US than on Group NS | 3.03 | 2.35 | 4.33 | from the risk difference interval |
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 | Group US | Ultrasound guided block :~20ml Prilocaine 1% and 10ml Ropivacaine 0.75% (30ml Prilocaine 1% in outpatients) | 112 | 118 | OG000 |
| Group 2 | Group NS | Nerve stimulation technique:~20ml Prilocaine 1% and 10ml Ropivacaine 0.75% (30ml Prilocaine 1% in outpatients) | 73 | 118 | OG001 |
Source ClinicalTrials.gov
Outcome
- Type
- PRIMARY
- Title
- Success Rate Without Supplementation
- Description
After injection of local anesthetic a waiting period of 30-60 minutes was defined before completing a failed block.~1. success without supplementation = no additional analgetics or rescue blocks required (success rate without supplementation, outcome measure 1)~2. success with supplementation = analgetics or selective rescue blocks distal of the sciatic division required (success rate without supplementation and additionally all supplemented blocks, outcome measure 3)~3. failed block = change of anesthetic procedure (general, spinal) or rescue blocks proximal of the sciatic division
- Time frame
- within 30-60 minutes after injection of the local anesthetic
- Population
In the NS group two investigators were necessary in order to realize the blinded study protocol. For personnel reasons this was not possible in every case and led to deviations from the randomization protocol for seven patients in each group. These patients were excluded from the analysis.
Source ClinicalTrials.gov
Trial
- Title
- Ultrasound Guided Distal Sciatic Nerve Block - a Comparison With Nerve Stimulator Technique
- NCT number
- NCT01643616
- Phases
- NA
- Conditions
- Other Surgical Procedures
- Interventions
- midazolam, Prilocaine 1%, Ropivacaine 0.75%, Prilocaine 1%, ultrasound guidance, nerve stimulation technique
- Lead sponsor
- Helios Research Center
- Results first posted
- 2013-11-01
- Results on ClinicalTrials.gov
- https://clinicaltrials.gov/study/NCT01643616?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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