Figure 1. The duration of analgesia for each patient during the 24-h observation period. Values are presented as the median and range. B0.25 = bupivacaine 0.25%; R0.25 = ropivacaine 0.25%; R0.5 = ropivacaine 0.5%. *The R0.5 group was significantly different compared with the other groups. No other differences were significant.