Table 16_2_2-1 2008 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. Table 16_2_2.1Perforated appendixes per 1,000 admissions with appendicitis, age 18 and over, in Indian Health Service tribal direct and contract hospitals and community hospitals,a 2005Population groupRateSETotalAge adjustedb355.80.1Unadjusted318.31.9Age18–44254.82.145–64469.84.165 and over428.68.4GenderMale355.62.7Female277.22.7a Service population does not include the Portland and California regions.b The total estimates are age adjusted using the total U.S. population for 2000 as the standard population.Key: AI/AN: American Indian or Alaska Native; SE: standard error.Source: Indian Health Service (IHS), Office of Information Technology/National Patient Information Reporting System (OIT/NPIRS), National Data Warehouse, Workload and Population Data Mart. Current as of September 2009 Internet Citation: Table 16_2_2-1: 2008 National Healthcare Quality and Disparities Reports. September 2009. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/nhqrdr/nhqrdr08/16_prioritypopulations/T16_2_2-1.html