Chapter 12 Objective questionnaires for assessment sleep quality

Rating scales play an important role in clinical practice and research. They can be used to assist in determining the nature of patients' problems to chart any changes in their condition, and as outcomes in sleep studies. Constructing a useful scale is a multistage process. The first is to devise the items that will constitute the scale. The items then need to be checked to determine if they are understandable and free from any biases. …