. Author manuscript; available in PMC: 2012 Oct 1.

Published in final edited form as: Anesth Analg. 2011 Apr 5;113(4):897–903. doi: 10.1213/ANE.0b013e318212495b

Table 2.

Post-randomization catheter insertion and surgical characteristics

	Femoral Infusion (n=25)	Posterior Lumbar Plexus Infusion (n=22)	p-Value
Catheter insertion time (min)	7.0 (4.0–17.2)	12.5 (6.2–19.7)	0.03
Catheter inserted past needletip (cm)	11.0 (5.0–13.0)	0.5 (0.0–1.0)	N/A
Minimum current via needle (mA)	0.46 (0.33–0.56)	0.52 (0.27–0.72)	0.09
Minimum current via catheter (mA)	0.48 (0.24–0.65)	0.40 (0.20–0.80)	0.82
OR hydromorphone equivalents (mg)	0.5 (0.4–0.9)	0.7 (0.4–2.3)	0.10
OR fentanyl (µg)	350 (180–500)	350 (250–500)	0.66
Time of incision (time)	11:00 (8:00–13:42)	10:30 (7:06–14:00)	0.93
Surgery duration (min)	134 (107–207)	138 (100–177)	0.74

Values are reported as median (10^th–90^th percentiles). P-values were derived from two-sided, two-sample t-tests assuming unequal variances.

N/A: not applicable

OR: operating room.