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5 vs postoperative 3.8; p .001), as was confidence in performing blockade based upon the imaging (preoperative 4.8 vs postoperative 4.2; p .001). Larger BMI negatively affected visualization of the brachial plexus in the preoperative period (p 0.05 for both weight categories). Patients with intermediate-high risk or confirmed obstructive sleep apnea had lower aggregate postoperative mean scores compared to the low-risk group for both ultrasound visualization (3.4 vs 4.0; p .05) and confidence in block performance (3.8