Doering, L., et al. (2007). Utility of observer-rated andself-report instruments for detecting major depression in womenafter cardiac surgery: A pilot study. 1- What was the median score for the original BDI in the whole sample? 2- If you use the cut off of a score of 10 on the BDI to diagnose depression what percent of patients meet the diagnostic criteria? 3- Was there a statistically significant difference in preoperative risk between the two groups? 4- Was there a statistically significant different in educational level for the subjects who were depressed and those who were not?.