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

Table 3 Regression model estimates for shifting services to outpatient settings and readmission by DRG policy intervention

Variables	Pre-Intervention	First Intervention			Second Intervention
	7/2011-6/2012	7/2012-6/2013			7/2013~6/2014
	N (%)	N (%)	B	DID	N (%)	B	DID
Shifting services to outpatient settings
Large hospital
MPH	55,388(31.12)	64,398(35.43)	1.25***	0.94***	68,360(37.50)	1.09***	1.00
VPH	13,373(28.67)	14,111(33.84)	1.33***	0.94***	14,247(36.08)	1.10***	1.00
Small hospital
MPH	12,141(14.29)	20,047(18.46)	1.13***	0.99	31,553(22.31)	1.08***	1.02
VPH	339,579(48.32)	337,344(49.42)	1.05***	0.99	321,412(49.61)	0.99*	1.02
Readmission
Large hospital
MPH	4,142(2.98)	4,022(2.85)	0.95*	1.14*	2,312(1.67)	0.59***	0.82*
VPH	597(1.42)	433(1.16)	0.85*	1.14*	300(0.85)	0.73***	0.82*
Small hospital
MPH	1,576(1.86)	702(0.72)	0.38***	0.40***	735(0.66)	0.92	0.99
VPH	3,103(0.86)	2,829(0.82)	0.95	0.40***	2,548(0.80)	0.96	0.99

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.
Patients with cataract surgery as the primary diagnosis were excluded in total analysis.
*p<0.05 ***p<0.001

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