The most common safety outcomes in the methylprednisolone and placebo group were infection ( @ -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- ) , surgical site infection ( @ -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- ) , and delirium ( @ -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- ) .