What is/are validated or widely used and accepted tests to score anxiety/depression/stress in clinical studies? (I see HADS, PHQ9, Hamilton in literature)
If used as an outcome measure, there is actually some indication that the Clinical Global Impression scale is very sensitive to treatment effects. Probably the most evidence-based (and most expensive) thing is to combine multiple sources of information (BMC Psychiatry. 2011 May 14;11:83. doi: 10.1186/1471-244X-11-83.)