With adjustment for sex , age ( < 30 v 30 years ) , and Children 's Oncology Group-recommended screening frequency group ( annual , 2 years , or 5 years ) , survivors in the APN group were > 2 more likely than those in the control group to complete the recommended cardiomyopathy screening ( RR , 2.31 ; 95 % CI , 1.74 to 3.07 ) .