2-2 PHQ PHQ was originally used to evaluate the health situation of general public in community, and PHQ-9, a part of this scale, which used to evaluate the tendency of Major Depression. And the content of PHQ-9 is correlated to the 9 diagnosis items with DSM IV. Scholars modified a new vision of PHQ-2, and the reliability and validity is good on the public of Taiwan (Sensitivity: 88.0%, Specificity: 81.9%) (Lu et al., 2010). Therefore the investigators use the scale to train nurses to screen if there is possibility of Major Depression in patients. The two questions are related to the symptoms of "depressed mood" and "lost of interest".