Effectiveness and safety of continuous wound infiltration for postoperative pain management after open gastrectomy

Table 1 Demographic characteristics of the patients studied (mean ± SD)

Parameter	Group PCIA	Group EA	Group CWI	P value
Age (yr)	63.56 ± 10.21	62.40 ± 9.69	61.96 ± 12.72	0.831
BMI (kg/m2 )	23.37 ± 3.87	22.90 ± 3.46	22.60 ± 2.27	0.701
Sex
F/M, n/n	8/17	11/14	9/16	0.671
%/%	32/68	44/56	36/64
ASA status
I/II/III, n/n/n	6/17/2	6/14/5	4/18/3	0.657
%/%/%	24/68/8	24/56/20	16/72/12
Surgical approach
Subtotal/total, n/n	16/9	19/6	18/7	0.637
%/%	64/36	76/24	72/28
Ulcer/tumor, n/n	4/21	2/23	1/24	0.032
%/%	16/84	8/92	4/96
Blood loss (mL)	161.60 ± 58.50	167.60 ± 48.93	157.20 ± 60.66	0.807
Time of operation (min)	251.20 ± 63.02	268.40 ± 66.67	263.20 ± 52.10	0.594
Length of wound (cm)	16.48 ± 3.49	16.68 ± 3.53	15.48 ± 3.23	0.418

BMI: Body mass index; ASA: American Society of Anesthesiologists.