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The National Inpatient Sample replaces the Nationwide Inpatient Sample for database year 2012 onward. The National Inpatient Sample implements an improved sample design for more accurate representation of national discharge data. The previous NIS contained all discharge records from a sample of hospitals participating in HCUP. The revised database contains a sample of discharge records from all hospitals participating in HCUP. The database was redesigned in 2012 to improve national estimates.


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