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Sex (Man / Woman) Mean age (year)±SD Mean body mass index (kg/m²)±SD Chemotherapy, n (%) Diabetes, n (%) Corticosteroid, n (%) Mean preoperative albumin level (g/ml) ±SD Type of stoma (ileostomy / colostomy) Median stoma holding period (days) Median duration of surgery (min) Median operative blood loss (ml) Median hospital stay (days) Median following period (days)Wound size at 1POD (length×width×depth(mm))Wound size at 4POD (length×width×depth(mm))Wound size at 7POD (length×width×depth(mm))602confirmed in 1 patient in the control group and 3 patients in the NPWT group (Table 2). DiscussionStoma closure is generally considered minor surgery, although the rate of complications is high at 20 to 40%. Stoma closure is classified as a class 3 contaminated wound, which has a high risk of SSI. SSI is one of the most common complications in the postoperative treatment of contaminated wounds. Table 1　Patient characteristicsFigure 2　Comparison analysis for reduction ratio between closure methodsPOD: postoperative days NPWT: negative-pressure wound therapyControl(N＝21)17 / 461.5±11.022.0±2.09 (42.9%)3 (14.3%)0 (0%)4.1±0.3220 / 1238 (34-569)96 (64-152)15.0 (3-80)8.0 (7-35)639 (7-1758)4500 (1700-16500)3150 (15-14212)2366 (15-9856)Many surgical techniques have aimed at improving outcomes by reducing the rate of SSI. PSC was first introduced by Banerjee et al. to reduce SSI after stoma closure6). In 2002, Sutton et al. reported good results of a 0% SSI rate after PSC7). In 2007, Haku et al. compared PSC with simple closure, and reported an SSI rate of 27% by simple closure and 0% by PSC. In addition, in 2009 and 2010, Milanchi et al. and Marquez et al., respectively, reported that the SSI rate after simple closure was 40% and NPWT(N＝32)18 / 1462.3±13.921.6±3.011 (34.4%)5 (15.6%)1 (3.1%)4.1±0.4327 / 5175 (19-814)87 (56-424)11.5 (3-370)8.0 (7-22)862 (8-1337)7050 (1000-22500)3825 (245-28512)1650 (180-9000)P-value0.060.580.310.531.01.00.300.380.200.480.320.660.740.180.230.45