Is the timing of radiological intervention and treatment day associated with economic outcomes in DRG-financed health care systems: a case study

Napierala, Christoph; Boes, Stefan

doi:10.1186/s12913-017-2055-0

Table 6 Incremental DRG fixed effects models with and without emergency cases

From: Is the timing of radiological intervention and treatment day associated with economic outcomes in DRG-financed health care systems: a case study

	(1) Basic model	(2) Extended model	(3) Model incl. patient confounding	(4) Model incl. all confounders	(5) Emergency cases	(6) Non-emergency cases
Basic model weekends
Scanning WE	−0.181^∗∗∗	−0.079^∗∗∗	−0.080^∗∗∗	−0.071^∗∗∗	−0.061^∗	−0.079^∗
	(0.030)	(0.021)	(0.021)	(0.021)	(0.027)	(0.038)
Treatment WE	−0.077^∗	−0.008	−0.009	0.005	0.011	0.015
	(0.036)	(0.025)	(0.025)	(0.025)	(0.029)	(0.058)
Discharge WE	0.175^∗∗∗	0.084^∗∗∗	0.079^∗∗∗	0.062^∗∗∗	0.074^∗∗∗	0.043^∗
	(0.020)	(0.014)	(0.014)	(0.014)	(0.020)	(0.018)
Admission WE	−0.044^·	−0.031^·	−0.032^·	−0.016	−0.006	−0.005
	(0.024)	(0.017)	(0.017)	(0.017)	(0.021)	(0.029)
Interaction WE scan and treatment	0.462^∗∗∗	0.200^∗∗∗	0.203^∗∗∗	0.191^∗∗∗	0.160^∗∗∗	0.107
	(0.051)	(0.036)	(0.036)	(0.036)	(0.042)	(0.087)
Number of exams		−0.046^∗∗∗	−0.045^∗∗∗	−0.037^∗∗∗	−0.034^∗∗∗	−0.041^∗∗∗
		(0.003)	(0.003)	(0.003)	(0.004)	(0.005)
Diff. scan and admission (in days)		−0.063^∗∗∗	−0.063^∗∗∗	−0.062^∗∗∗	−0.068^∗∗∗	−0.055^∗∗∗
		(0.002)	(0.002)	(0.002)	(0.003)	(0.003)
Diff. treatment and scan (in days)		0.007^∗∗∗	0.007^∗∗∗	0.008^∗∗∗	0.014^∗∗∗	0.001
		(0.001)	(0.001)	(0.001)	(0.002)	(0.002)
Diff. dismissal and scan (in days)		−0.051^∗∗∗	−0.051^∗∗∗	−0.050^∗∗∗	−0.056^∗∗∗	−0.041^∗∗∗
		(0.001)	(0.001)	(0.001)	(0.001)	(0.001)
Patient data
Female			−0.038^∗∗∗	−0.041^∗∗∗	−0.044^∗∗	−0.039^∗∗
			(0.010)	(0.010)	(0.014)	(0.013)
Age			−0.003^∗∗∗	−0.003^∗∗∗	−0.003^∗∗∗	−0.003^∗∗∗
			(0.000)	(0.000)	(0.000)	(0.000)
Private insurance			0.009	0.006	0.008	0.023
			(0.011)	(0.010)	(0.015)	(0.014)
Clinical data
Deceased				0.355^∗∗∗	0.351^∗∗∗	0.150^∗∗
				(0.029)	(0.035)	(0.057)
Emergency				−0.120^∗∗∗
				(0.012)
Internal medicine case
Surgical case
MRI				−0.007	−0.010	0.009
				(0.028)	(0.037)	(0.045)
CT				0.011	0.004	0.001
				(0.025)	(0.033)	(0.041)
X-ray				0.069^∗∗	0.052	0.099^∗
				(0.025)	(0.033)	(0.042)
Complicated radiology case				−0.143^∗∗∗	−0.148^∗∗∗	−0.123^∗∗∗
				(0.017)	(0.023)	(0.025)
R² (proj model)	0.019	0.501	0.506	0.520	0.539	0.468
Num. obs.	11371	11371	11371	11371	6234	5137
R² (full model)	0.244	0.616	0.619	0.630	0.667	0.666

^∗∗∗ p<0.001, ^∗∗ p<0.01, ^∗ p<0.05, ^· p<0.1 Table indicating clustered standard errors including emergency and non-emergency cases We report R² instead of Adj. R² because of the enhanced collinearity through the DRG fixed effects model. Leading to a negative Adj. R² that would have to be interpreted as 0

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