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

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

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   
  1. *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