Coronary progression , measured in mean ( SD ) change , worsened with HRT by 0.047 ( 0.15 ) mm/y and by 0.024 ( 0.15 ) mm/y with HRT placebo ( P = .17 ) ; and for antioxidant vitamins by 0.044 ( 0.15 ) mm/y and with vitamin placebo by 0.028 ( 0.15 ) mm/y ( P = .32 ) .
