American Society of Anesthesiologists

Fig. 2. Logistic regression plot of anesthesia success: calculation of ED50and ED95. The logistic regression plot of anesthesia success versus dose of intrathecal bupivacaine is shown. Probabilities of 0.5 and 0.95 were used to derive ED50and ED95, respectively, for both the success of induction of regional anesthesia and the success throughout surgery.

Fig. 2. Logistic regression plot of anesthesia success: calculation of ED⁵⁰and ED⁹⁵. The logistic regression plot of anesthesia success versus dose of intrathecal bupivacaine is shown. Probabilities of 0.5 and 0.95 were used to derive ED⁵⁰and ED⁹⁵, respectively, for both the success of induction of regional anesthesia and the success throughout surgery.

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