The prostate cancer dietary index score was associated with decreased risk of prostate cancer [ OR per 1 score increment : 0.91 ; 95 % confidence interval ( CI ) : 0.84-0 .99 ; Ptrend = 0.04 ] but the WCRF/AICR index score was not ( OR : 0.99 ; 95 % CI : 0.94-1 .05 ; Ptrend = 0.71 ) .