Fig. 3From: Intrathecal dexmedetomidine as an adjuvant to plain ropivacaine for spinal anesthesia during cesarean section: a prospective, double-blinded, randomized trial for ED50 determination using an up-down sequential allocation methodDose‒response curves for intrathecal dexmedetomidine coadministered with ropivacaine for cesarean section in the two groups derived from probit regression analysis. Dashed lines indicate the position of the estimates of ED50Back to article page