The relative risk ( RR ) from a Cox proportional hazard model of nursing home placement ( intent-to-treat estimate ) after adjusting for caregiver sex , patient age , and patient income was 0.65 ( 95 % confidence interval [ CI ] , 0.45 to 0.94 ; P = .02 ) , indicating that caregivers were approximately two thirds as likely to place their spouses in nursing homes at any point in time if they were in the treatment group than if they were in the control group .
