Fig. 3. Spread of anesthesia with 10 mg of bupivacaine as isobaric or hyperbaric solution. Each point represents individual data for pinprick blockade level or cold sensation blockade level. The median level in each group is represented by the solid bar (P = pinprick; C = cold sensation). † P < 0.05 vs. 2 ml and * P < 0.05 vs. 5 ml.