The predictive value of each model is represented by the C-statistic. A nonparametric approach for evaluating each C-statistic was used.8 P values of less than 0.05 were considered to indicate statistical significance for all tests. All statistical analyses were performed by the Duke Clinical Analysis Institute with the use of SAS software, version 9.2 . Results Research Population From 2004 through April 2008 January, data for 1,989,779 patients undergoing cardiac catheterization at 663 sites were entered into the NCDR .Be glad that your brain still worksIf you are concerned and stressed concerning this, you ought to be glad. This means you still have a properly functioning mind. Your brain has not melted under the chemical fire and propaganda most brains have been subject to in the Western world. You have your wits about you! You are among the lucky ones. You are not a zombie! Feel lucky. This is an excellent start. 2. Be pleased with yourself for viewing the truth and avoiding sheeple-domEven highly functioning minds are capable of denying reality, since it stares them in the face even.