1. The study also talks about a modification of the BDI which is the Beck Depression Inventory Short Form (BDI-SF) which was developed because there were concerns that the original BDI which included physical signs and symptoms of depression might over diagnose depression if used with populations who are medically ill. (This is a perfect example of being careful not to over-generalize results. The appropriate total score in a medically healthy population indicating depression may not be appropriate for a population which has medical illnesses contributing additional physical symptoms.) The modified BDI-SF was designed for detecting depression in medically ill patients and when using a cutoff of a score of ten, the BDI-SF has a sensitivity of 100% and a negative predictive value of 100% for hospitalized patients. What does this mean?