Here is the design of a clinical trial:

Official Title: Evaluation of Perfusion Index as an Objective Measure for Supraclavicular Brachial Plexus Block in Pediatric Patients

Included conditions:
- Supraclavicular Brachial Plexus Block

Study Armgroups:
- {'label': 'Sevoflurane Group', 'description': 'sevoflurane is used for anesthetic induction', 'interventionNames': ['Device: perfusion index']}
- {'label': 'Propofol Group', 'description': 'intravenous anesthetic propofol is used for anesthetic induction', 'interventionNames': ['Device: perfusion index']}

Interventions:
- {'type': 'DEVICE', 'name': 'perfusion index', 'description': 'perfusion index in the prediction of peripheral block success was previously reported for infraclavicular brachial plexus block, axillary brachial plexus block, interscalene brachial plexus block, and supraclavicular brachial plexus in adult patients', 'armGroupLabels': ['Propofol Group', 'Sevoflurane Group']}

Primary Outcomes:
- {'measure': 'perfusion index', 'description': 'Correlation between success of supraclavicular brachial plexus block and perfusion index', 'timeFrame': 'the time span between 1 day preoperative and 24 hours after surgery'}

Please estimate the sample size based on the assumption: 
Type I Error (Alpha) levels considered are 0.20, 0.10, 0.05, and 0.01. Type II Error (Beta) levels considered are 0.20, 0.10, 0.05, and 0.01. The withdrawal rate is assumed to be 10%.
Sample size
        According to literature reports [15], the probability of ulnar nerve insufficiency is less than 20%; the sample size is calculated: As shown in Table 1, the preliminary estimated sample size is 47 cases, and the withdrawal rate is assumed to be 10%. The calculation is 52 cases per group, so 104 children will be included in this experiment.Table 1Sample size estimation resultsType I Error- Alpha0.200.100.050.01Type II Error -Beta0.2016 + 423 + 630 + 846 + 120.1021 + 629 + 837 + 1054 + 140.0526 + 735 + 943 + 1162 + 160.0137 + 1047 + 1257 + 1578 + 20