Table 1.

Groups characteristics

Parameter	Group 1 NPWT	Group 2 control	p value
Number of patients, n	35	36	n/a
Females, n (%)	11 (31.4%)	16 (44.4%)	0.259
Males, n (%)	24 (68.6%)	20 (55.6%)
Mean age, years ± SD	61.6 ± 11.3	62.4 ± 11.3	0.974
Body mass index, kg/m2 ± SD	26.2 ± 4.5	26.2 ± 4.3	0.794
ASA 1, n (%)	1 (2.9%)	1 (2.8%)	0.943
ASA 2, n (%)	22 (62.9%)	24 (66.7%)
ASA 3, n (%)	12 (34.2%)	11 (30.5%)
Any comorbidity, n (%)	25 (71.4%)	26 (72.2%)	0.942
Cardiovascular disease, n (%)	11(31.4%)	7 (19.4%)	0.252
Hypertension, n (%)	18(51.4%)	13 (36.1%)	0.199
Diabetes, n (%)	5 (14.3%)	5 (13.9%)	0.962
Pulmonary disease, n (%)	3 (8.6%)	4 (11.1%)	0.724
Renal disease, n (%)	2 (5.7%)	2 (5.6%)	0.977
Other comorbidity, n (%)	15 (42.8%)	14 (38.9%)	0.738
Smoking, n (%)	5 (14.3%)	6 (16.7%)	0.785
Immunosuppressive treatment, n (%)	3 (8.6%)	1 (2.8%)	0.297
Radiotherapy n (%)	27 (77.1%)	29 (80.6%)	0.729
Chemotherapy (pre- or postoperative), n (%)	27 (77.1%)	28 (77.8%)	0.950
AJCC Stage 0, n (%)	7 (20%)	11 (30.6%)	0.319
AJCC Stage I, n (%)	7 (20.0%)	9 (25.0%)
AJCC Stage II, n (%)	7 (20.0%)	7 (19.4%)
AJCC Stage III, n (%)	13 (37.1%)	6 (16.7%)
AJCC Stage IV, n (%)	1 (2.9%)	3 (8.3%)
Median time between operations, days (IQR)	148 (17–687)	139 (25–517)	0.296
Previous operation
Hemicolectomy, n (%)	4 (11.4%)	4 (11.1%)	0.829
Colectomy, n (%)	2 (5.7%)	2 (5.5%)
Anterior resection of rectum n (%)	8 (22.9%)	13 (36.1%)
Intersphincter resection n (%)	3 (8.6%)	4 (11.1%)
TaTME, n (%)	18 (51.4%)	15 (41.7%)

NPWT negative pressure wound therapy

SD standard deviation

ASA American Society of Anaesthesiologists class

AJCC American Joint Committee on Cancer tumor stage

IQR inter−quartile range

TaTME transanal total mesorectum excision