Table 1.

Sample sizes and computation of each sample data

Sample type	Computation standard
HIRA - National Inpatient Sample (2009-2011)	700,000 inpatients per year (13%), approximately 400,000 outpatients per year (1%)
HIRA - National Patient Sample (2010-2011)	1.4 million patients overall per year (3%)
HIRA - Adult Patient Sample (2010-2011)	Approximately 1 million patients over the age of 65 per year (20%)
HIRA - Pediatric Patient Sample (2010-2011)	Approximately 1.1 million patients under the age of 20 per year (10%)

The size of each sample data is either 1.5 million patients or 20% of the total number in the corresponding area of the original data

HIRA, Health Insurance Review and Assessment Service.