Delirious patients were more likely to be male ( 61.1 % vs 46.6 % ; p = 0.005 ) , have a surgical/trauma diagnosis ( 21.2 % vs 11.0 % ; p = 0.030 ) , and history of tobacco ( 31.5 % vs 16.2 % ; p = 0.002 ) or alcohol use ( 34.6 % vs 20.9 % ; p = 0.009 ) .