Annual sexual assault rates decreased from 17.9 / 100 person-years at baseline to 11.1 at follow-up ( rate ratio = 1.61 ; 95 % confidence interval [ CI ] , 1.26-1 .86 ; P < .001 ) ; there was no significant change in the SOC group ( 14.3 to 14.0 , rate ratio = 1.02 ; 95 % CI , 0.67-1 .57 , P = .92 ) .