We developed covariate-altered Cox models to estimate hazard ratios for CABG in comparison with PCI. 9 We used the method of Lin et al then.11 to assess whether the observed differences in the rate of death could be fully explained by an unmeasured confounder. Results Characteristics of the scholarly research Population A total of 1 1,542,872 claims for PCI and 581,036 promises for CABG, for 1,943,653 unique patients, january 1 were recorded in the CMS data source between, 2004, and December 31, 2007, at 644 sites participating in both the CathPCI Registry and the ACD.Methods Participants Patients were eligible to participate in the study if they were 18 years of age or older, had a diagnosis of schizophrenia or schizoaffective disorder seeing that assessed by using the Structured Clinical Interview based on the fourth edition of the Diagnostic and Statistical Manual of Mental Disorders,15 and were at an increased risk for psychiatric hospitalization as evidenced by current psychiatric hospitalization, hospitalization in the previous 24 months, or increased usage of mental health providers to prevent relapse as adjudicated by the analysis chairpersons . The initial entry criteria required hospitalization in the last year but were expanded to enhance recruitment . In September 2006 Randomization began, and data collection continued for 3 years, with 209 of 369 sufferers randomly assigned in the first year, 140 sufferers assigned in the second year, and 20 patients assigned through the first three months of the 3rd year.