In the ITT population ( N = 570 ) , family members had PTSD-related symptoms significantly more frequently in the control group than in the intervention group [ adjusted odds ratio , 1.8 ; 95 % confidence interval ( CI ) 1.1-3 .0 ; P = 0.02 ] as did family members to whom physicians did not propose witnessing CPR [ adjusted odds ratio , 1.7 ; 95 % CI 1.1-2 .6 ; P = 0.02 ] .