2011 National Healthcare Quality and Disparities Reports
|Median income of patient's ZIP Code|
|Total||First quartile (lowest income)||Second quartile||Third quartile||Fourth quartile (highest income)|
a. Consistent with the Agency for Healthcare Research and Quality (AHRQ) Prevention Quality Indicators (PQI) software, chronic obstructive pulmonary disease must be the principal diagnosis.� Transfers from other institutions are excluded. Rates prior to 2005 are not reported because of International Classification of Diseases, 9th Revision (ICD-9-CM) coding changes.
Key: SE: standard error.
Source: Agency for Healthcare Research and Quality (AHRQ), Center for Delivery, Organization, and Markets, Healthcare Cost and Utilization Project, Nationwide Inpatient Sample and AHRQ Quality Indicators, modified version 4.1.