Figure 2. Pain scores 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. Pain scale: 0 = no pain, 10 = worst pain ever. 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 < 0.01). **Significantly greater than groups FB and FBE (by repeated measures of ANOVA, P < 0.01).