Figure 1. Epidural infusion rate at 4-h intervals during epidural treatment. Values are the mean +/− SD for all patients remaining at the indicated time. Plot symbols for groups FB and FE are slightly offset for clarity. F = 3 [micro sign]g/ml fentanyl, FB = 3 [micro sign]g/ml fentanyl + 0.01% bupivacaine, FE = 3 [micro sign]g/ml fentanyl + 0.5 [micro sign]g/ml epinephrine, FBE = 3 [micro sign]g/ml fentanyl + 0.01% bupivacaine + 0.5 [micro sign]g/ml epinephrine. *Significantly greater than groups FB, FE, FBE (by repeated measures of analysis of variance [ANOVA], P < 0.001). **Significantly greater than group FBE (by repeated measures of ANOVA, P < 0.001).