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Mean hourly bupivacaine use (mL/h) in women receiving epidural analgesia with bupivacaine, 1.25mg/mL, alone (open bars) or with neostigmine, 4 μg/mL (filled bars). Data are presented for all patients in the study and for those with study drug duration > 4 hr. *P < 0.05 compared to bupivacaine alone. The whisker represents the standard deviation of the data.
