Impact of DRGs-based inpatient service management on the performance of regional inpatient services in Shanghai, China: an interrupted time series study, 2013–2019

Table 2 Results of change in performance indicators pre- and post- policy intervention

Indicator	Variable	β	S.E.	T	P	DW	DF
DRGs number	Intercept	478.43	6.55	73.081	0.000***	1.930	−4.763*
	β₁	3.24	0.68	4.792	0.000***
	β₂	−6.94	24.65	−0.281	0.781
	β₃	0.37	1.24	0.298	0.768
CMI	Intercept	0.694	0.008	88.635	0.000***	1.889	−5.263*
	β₁	−0.0002	0.001	−0.266	0.793
	β₂	−0.103	0.029	−3.479	0.002**
	β₃	0.008	0.001	5.419	0.000***
Total weight	Intercept	11,000.44	395.31	27.827	0.000***	1.91	−4.844*
	β₁	100.04	40.88	2.447	0.022*
	β₂	−3719.05	1488.41	−3.499	0.020*
	β₃	250.13	75.13	3.329	0.003**
TEI	Intercept	1.10	0.01	111.191	0.000***	1.716	−5.379*
	β₁	−0.01	0.001	−5.374	0.000***
	β₂	0.12	0.04	3.087	0.005**
	β₃	−0.01	0.002	−2.942	0.007**
CEI	Intercept	0.83	0.02	35.084	0.000***	1.079***	−5.262*
	β₁	0.01	0.002	5.090	0.000***
	β₂	0.31	0.09	3.665	0.001**
	β₃	−0.02	0.005	−3.477	0.002**
IMLRG	Intercept	0.12	0.03	3.738	0.001**	1.697	−5.854*
	β₁	0.0002	0.003	0.061	0.952
	β₂	0.07	0.12	0.622	0.540
	β₃	−0.01	0.01	−1.191	0.245
IMMLRG	Intercept	1.20	0.11	10.847	0.000***	2.288	−7.127*
	β₁	−0.02	0.01	−1.992	0.058·
	β₂	0.14	0.42	0.325	0.748
	β₃	−0.02	0.02	−0.734	0.470

*p < 0.05; **p < 0.01; ***p < 0.001. Durbin-Watson test all indicated no autocorrelation, except CEI. Dickey–Fuller results indicated that there is no unit root and time series is stationary. The intervention study period was between 2013 to 2019, where pre-intervention was from 2013 to 2016 and post-intervention was from 2017 to 2019

ISSN: 1472-6963