In intent-to-treat analysis , participants receiving the combined supplement of multivitamins plus selenium had a significantly lower risk vs placebo of reaching CD@ cell count @/L or less ( adjusted hazard ratio -LSB- HR -RSB- , @ ; @ % CI , @-@ @ ; P = @ ; absolute event rate -LSB- AER -RSB- , @ / @ person-years ; censoring rate , @ ; @ events ; placebo AER , @ / @ person-years ; censoring rate , @ ; @ events ) .