Figure 2. Trends in clinical utility and transparency values of RCTs on RA of lower extremity surgeries by year of publication. (A–C) The distribution of summed values for clinical utility criteria (A), transparency criteria (B), and total usefulness (C) across publication years. Each dot represents an individual RCT. Red dashed lines indicate fitted linear regression lines. RA, regional anesthesia; RCTs, randomized controlled trials.