Patient characteristics that appeared to negatively influence OS included more advanced age ( hazard ratio -LSB- HR -RSB- @ for @ vs < @ years ; p = @ ) , poorer performance status at baseline ( HR @ for @ or @ vs @ ; p = @ ) , poor cytogenetics ( HR @ for intermediate vs poor ; p = @ ) , higher bone marrow blast counts ( HR @ for > @ % vs @ % ; p = @ ) , low baseline platelet counts ( HR @ for each additional @ @/L ; p = @ ) , and high white blood cell counts ( HR @ for each additional @ @/L ; p = @ ) .