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Legend
Table 1. patient characteristic
Table 2. The ED50 and 95% confidence interval (CI) of different models
Figure 1. Sequential block results of ultrasound-guided sciatic nerve block using ropivacaine 20mL according to the Dixon and Massey up-and-down method.
Figure 2. Estimated ropivacaine–sciatic nerve block relationship for a given dose level and probability of successful block. Median estimators for each model are plotted. The numbers of measurements at each ropivacaine concentration are represented by numbered triangles.
Figure 3. postoperative pain scores. A: Rest pain score 24 hours after surgery. B: motor pain score 24 hours after surgery. C: Duration of sciatic nerve block with different concentrations of ropivacaine. D: Correlation between ropivacaine concentration and time to 1st rescue analgesic in sciatic nerve block