An evaluation of the validity of inferences made from 3 diabetes assessment instruments: a Rasch analysis.

Background: Many patients who have diabetes lack adequate knowledge, positive attitudes, and sufficient resources to achieve optimal outcomes in the management of their disease. A key to assessing the impact of pharmacists' interactions with diabetes patients is the resultant impact on patient knowledge, attitudes, and satisfaction. As such, it is important that quality instruments be used to obtain accurate and dependable measures of these outcomes.