Effects of fee-for-service, diagnosis-related-group, and mixed payment systems on physicians’ medical service behavior: experimental evidence

Table 5 Deviation between quantity choice and the optimal quantity

Group	Experimental Condition	q − q*	Pure Payment Scheme		Mixed Payment Scheme
Group	Experimental Condition	q − q*	Mean	SD	Mean	SD
I	A-D2	aggregate level	−1.27	1.33	−0.87	1.04
		moderate	−1.01	0.90	−0.49	0.64
		intermediate	−1.36	1.20	−0.97	0.91
		severe	−1.44	1.72	−1.14	1.35
II	A-D4	aggregate level	−1.51	1.39	−0.37	0.85
		moderate	−1.10	0.86	0.24	0.61
		intermediate	−1.48	1.18	−0.40	0.52
		severe	−1.95	1.83	−0.96	0.89
III	A-D6	aggregate level	−1.08	0.95	0.24	0.76
		moderate	−0.90	0.85	0.82	0.87
		intermediate	−1.16	0.89	0.11	0.46
		severe	−1.17	1.06	−0.22	0.42
IV	A-F8	aggregate level	0.85	1.12	0.68	1.12
		moderate	1.25	1.39	1.16	1.38
		intermediate	0.87	0.90	0.70	0.96
		severe	0.43	0.84	0.17	0.65
V	A-F6	aggregate level	0.78	1.31	0.20	1.10
		moderate	1.19	1.44	0.76	1.28
		intermediate	0.80	1.29	0.21	0.86
		severe	0.35	1.03	−0.37	0.77

This table shows the average deviation between physicians’ quantity choices and the optimal quantity q* under different payment schemes in groups I, II, III, IV and V. A-D2, A-D4, A-D6 are the pure DRG, adjusted Mix-more-DRG(2), Mix-more-DRG(4), Mix-more-DRG(6). A-F8 and A-F6 are the pure FFS, adjusted Mix-more-FFS(8) and Mix-more-FFS(6). “Aggregate level” refers to aggregate data for nine types of patients
DRG Diagnosis-Related-Group, FFS Fee-for-Service

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