Data Sources 2009 National Healthcare Quality and Disparities ReportsThe National Healthcare Quality Report (NHQR) is a comprehensive national overview of quality of health care in the United States. It is organized around four dimensions of quality of care: effectiveness, patient safety, timeliness, and patient centeredness. Data Sources Current as of June 2010Internet Citation:2009 National Healthcare Quality & Disparities Reports: Data Sources Appendix. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/qual/qrdr09/datasources/ Current as of March 2010 Internet Citation: Data Sources: 2009 National Healthcare Quality and Disparities Reports. March 2010. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/nhqrdr/nhqrdr09/datasources/index.html