Table 2. Comparison of Patients With and Without Prior Abdominal Surgery.

	No prior abdominal surgery n=12	History of prior abdominal surgery  n=7	t-value/x2-value	p-value
Age at surgery, median years (range)	73(36-85)	77(75-78)	t-value:1.345	0.182
Male, n (%)	8(66.7%)	4(57.1%)	x2-value:0.0	1.00
Body mass index, median kg/m2 (range)	24.6(19.6-31.6)	23.0(17.0-30.9)	t-value:1.305	0.308
Intraoperative findings of intestinal adhesion, n (%)	0(0%)	0(0%)	x2-value:0.0	1.00
Distance between transversus abdominis and intestine at the abdominal catheter entry site	2.2(0-20.4)	1.5(0-6.5)	t-value0.926	0.377