There were no statistically significant differences between the HA/CMC powder group and the no adhesion barrier group in SSIs ( @ % vs. @ % ; P = @ ) and serious SSIs ( @ % vs. @ % ; P = @ ) , or in the most frequent serious SSIs of pelvic abscess ( @ % and @ % ; significance not tested ) , anastomotic fistula ( @ % and @ % ) , and peritonitis ( @ % and @ % ) .