Psychometric properties of the Coolidge Correctional Inventory in a sample of 3,962 prison inmates.

The present study reports on the preliminary psychometric characteristics of a new personality and neuropsychological, 250-item, self-report measure, the Coolidge Correctional Inventory (CCI), in an archival de-identified sample of 3,962 prison inmates. The median internal reliability for the 33 CCI scales and subscales was alpha = .79 (range: alpha = .49 to .93). A prevalence estimate, based on the polythetic criteria in DSM-IV-TR, of at least one personality disorder was 61% of the entire sample, and the prevalence of ADHD was estimated to be 16%. Drug and alcohol problems were also highly prevalent (60%). These results appear to support the preliminary reliability and validity of the CCI and also reveal a high rate of psychopathology and neuropsychological dysfunction among prison inmates.