The proportion of women with detectable ( > 50 copies/mL ) HIV-1 RNA in breast milk appeared to be increased in the selenium group ( 36.4 % ) compared with those in the placebo group ( 27.5 % ) among the total cohort ( N = 420 ) , but results were borderline statistically significant ( relative risk [ RR ] , 1.32 ; 95 % confidence interval [ CI ] , 1.00-1 .76 ; P = 0.05 ) .