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NASS Description of Data Elements
The Nationwide Ambulatory Surgery Sample (NASS) is a set of ambulatory surgery databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.
 
HOSP_CONTROL - Control/ownership of hospital
 
Documentation Sections:
General Notes
Uniform Values
General Notes
 

The hospital's ownership/control category was obtained from the AHA Annual Survey of Hospitals and includes categories for government nonfederal (public), private not-for-profit (voluntary) and private investor-owned (proprietary). These types of hospitals tend to have different missions and different responses to government regulations and policies. HOSP_CONTROL is used as a stratifier for the HCUP nationwide databases: Nationwide Inpatient Sample (NIS), Kids' Inpatient Database (KID), and Nationwide Emergency Department Sample (NEDS).

When the sample size was sufficiently large, hospitals were stratified as public (HOSP_CONTROL=1), voluntary (HOSP_CONTROL=2), and proprietary (HOSP_CONTROL=3). This stratification was used for Southern rural, Southern urban nonteaching, and Western urban nonteaching hospitals. For smaller strata - the Midwestern rural and Western rural hospitals - a collapsed stratification of public versus private was used, with the voluntary and proprietary hospitals combined to form a single "private" category (HOSP_CONTROL=4). For all other combinations of region, location and teaching status, no stratification based on control was advisable given the number of hospitals in these cells (HOSP_CONTROL=0).

 
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Uniform Values
VariableDescriptionValueValue Description
HOSP_CONTROLControl/ownership of hospital0Government or private (collapsed category)
1Government, nonfederal (public)
2Private, not-for-profit (voluntary)
3Private, investor-owned (proprietary)
4Private (collapsed category)
.Missing
 
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Internet Citation: HCUP NASS Description of Data Elements. Healthcare Cost and Utilization Project (HCUP). August 2019. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/vars/hosp_control/nassnote.jsp.
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Last modified 8/14/19