There were no significant differences between patients in the @ groups with respect to cases with bloody fluid in the epidural needle during catheter insertion ( @ % vs @ % , P = @ ) , the epidural catheter during catheter placement ( @ % vs @ % , P = @ ) , aspiration of frank blood in the epidural catheter ( @ % vs @ % , P = @ ) , and blood noted in the caudal end of the epidural catheter upon removal ( @ % vs @ % ; P > @ ) .