Evaluations of the patient-centered medical home, a model that redesigns primary care, should account for clustering of patients within practices. This paper describes why and how to do this, and what samples of patients and practices are needed for studies to achieve adequate statistical power.

Personal health information is a valuable resource to individuals and their families, as well as health care providers. This issue brief describes the features of 21 software-based Personal Health Records (PHRs) and assesses whether the features match the needs and preferences of underserved...

As disease management for chronically ill people proliferates, providers are moving toward programs that incorporate computers with telecommunication features and other technology. Although these technologies hold promise for improving care coordination and delivering timely information more...