Worldwide concerns over the cost of medical care have highlighted the importance of evidence-based medicine. Resulting clinical trials require instruments to monitor the outcome of care and the output of the health system. "Measuring Health" is a reference text that provides in-depth reviews of over 100 leading health measurements used for these purposes. It guides the reader in choosing among rival methods and provides the information needed to apply and interpret each instrument. The book also provides a technical and historical introduction to the field of health measurement, and discusses future directions in the field. This third edition updates the information on each of the measures previously reviewed; it includes additional measures in each of the chapters and adds a chapter on anxiety measurement. Other chapters include disability, psychological well-being, depression, mental status, social health, pain and quality of life.