Table 2.

Population Data and Surgical Information

	Group 0.2% (n = 23)	Group 0.4% (n = 27)
Age (yr)	51 (28–57)	44 (27–57)
Sex (female/male)	10/13	11/16
Height (cm)	168 (162–178)	168 (163–178)
Weight (kg)	75 (64–89)	73 (65–95)
Minimum current via	0.49 (0.40–50)	0.48 (0.44–0.50)
needle (mA)
Minimum current via	0.45 (0.39–51)	0.42 (0.30–0.51)
catheter (mA)
Subjects receiving an	14	15
additional 20 mL
mepivacaine bolus (#)
Intraoperative	3 (2–4)	3 (2–4)
midazolam (mg)
Intraoperative fentanyl	188 (50–200)	125 (100–200)
(µg)
Intraoperative	0 (0–0)	0 (0–0)
morphine (mg)
Surgery duration (min)	75 (60–115)	75 (55–95)
Subjects from site	13/8/2	15/10/2
A/B/C (#)

Values are reported as median (25th–75th percentiles) or number of subjects, as indicated. Applying statistics to preintervention variables for subjects randomized to treatment groups is inappropriate. For this reason, no statistical comparisons were applied to the data of this table.