Effects of a mandatory DRG payment system in South Korea: Analysis of multi-year nationwide hospital claims data

Table 2 Regression model estimates for length-of-stay and total medical cost by DRG policy intervention period

Variables	Pre-Intervention	First Intervention			Second Intervention
	7/2011-6/2012	7/2012-6/2013			7/2013~6/2014
	Mean±SD	Mean±SD	B	DID	Mean±SD	B	DID
Length-of-stay
Large hospital
MPH	5.37±4.08	5.22±3.93	0.98***	1.01	4.21±2.51	0.86***	0.89***
VPH	5.71±3.27	5.52±2.73	0.97***	1.01	5.27±2.45	0.97***
Small hospital
MPH	6.49±2.99	5.34±2.49	0.91***	0.93***	4.53±2.65	0.96***	0.97***
VPH	2.55±2.18	2.45±2.06	0.98***	0.93***	2.35±2.00	0.99***
Total medical cost
Large hospital
MPH	1382±710	1353±705	0.98***	0.87***	1556±675	1.18***	1.15***
VPH	1370±497	1549±568	1.20***	0.87***	1590±600	1.02***
Small hospital
MPH	1032±401	1267±440	1.33***	1.38***	1188±469	1.01***	1.01***
VPH	836±216	809±301	0.95***	1.38***	802±309	1.00

MPH mandatory participation hospitals
VPH voluntary participation hospitals
DID difference-in-differences
Large hospital: tertiary hospitals + general hospitals; Small hospital: hospitals+ clinics.
Adjusted odds ratios obtained from generalized estimating equations analysis with all of the variables in Table 1.
All costs were controlled by medical insurance fees, which are annually adjusted and include un-insured costs.
1 USD = 1,200 Korean won (02/2016)
***p<0.001

ISSN: 1472-6963