During actual trial enrollment in the communities , 79 % ( range = 63 % -91 % ) of the 828 potential participants agreed in the ambulance to have the study drug started and provided informed consent at the hospital , an average of 13 percentage-points higher than projected by the survey ( 95 % confidence interval ( CI ) : 9 % -17 % ) , 19 % higher on a relative scale ( CI : 14 % -25 % ) .