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Logistic regression plot of probability of successful spinal anesthesia versus intrathecal bupivacaine dose of the 2 groups. Probability of 95% was used for deriving the ED95 of intrathecal bupivacaine to achieve successful spinal anesthesia for C-section. The ED95 and 95% confidence interval (CI) of intrathecal hyperbaric bupivacaine in Dex group and Control group were 7.4 mg (95% CI, 5.6–12.4 mg) and 11.0 mg (95% CI, 4.4–56.8 mg), respectively.
