There was no significant difference between the two treatment groups with respect to the primary end point of time to healing , which occurred in 56 ( 79 % ) of 71 patients after a median follow-up time of 15 days in the Mepilex Ag group compared with 65 ( 79 % ) of 82 patients after a median follow-up time of 16 days in the SSD group ( p = 0.74 ) .