Skip to main content

Table 3 Results of the econometric models

From: Volume-outcome relationship and minimum volume regulations in the German hospital sector – evidence from nationwide administrative hospital data for the years 2005–2007

Condition Year OLS with logarithm of case volume OLS with case volume tertiles (reference group: low case volume) OLS with binary variable whether minimum volume threshold is achieved Number of
Medium case volume High case volume
Coeff. S.E. Coeff. S.E. Coeff. S.E. Coeff. S.E. Hospitals Patients
Liver 2005 −0.0324* (0.0175) −0.0118 (0.0518) − 0.0513 (0.0354) −0.0531 (0.0588) 22 906
2006 −0.0331 (0.0267) −0.0027 (0.0356) −0.0441 (0.0513) −0.0383 (0.0448) 22 965
2007 − 0.0414 (0.0255) − 0.0263 (0.0520) − 0.0279 (0.0381) − 0.1285* (0.0732) 22 1064
Kidney 2005 −0.0026 (0.0067) 0.0017 (0.0057) −0.0010 (0.0066) −0.0035 (0.0129) 42 2610
2006 0.0001 (0.0055) −0.0043 (0.0062) 0.0050 (0.0059) −0.0013 (0.0128) 42 2699
2007 −0.0102 (0.0064) −0.0070 (0.0074) −0.0065 (0.0072) −0.0539*** (0.0156) 42 2885
Oesophagus 2005 −0.0292*** (0.0081) −0.0098 (0.0166) −0.0445* (0.0250) −0.0476*** (0.0177) 428 2898
2006 −0.0306*** (0.0074) −0.0284* (0.0166) −0.0668*** (0.0203) −0.0422*** (0.0157) 405 3107
2007 −0.0267*** (0.0075) −0.0159 (0.0157) −0.0262 (0.0203) −0.0186 (0.0147) 415 3190
Pancreas 2005 −0.0268*** (0.0050) −0.0494*** (0.0103) −0.0776*** (0.0135) −0.0586*** (0.0133) 696 7480
2006 −0.0280*** (0.0053) −0.0372*** (0.0105) −0.0568*** (0.0161) −0.0632*** (0.0112) 702 8031
2007 −0.0280*** (0.0051) −0.0387*** (0.0095) −0.0503*** (0.0150) −0.0597*** (0.0112) 680 8854
Stem cell 2005 0.0033 (0.0053) 0.0123 (0.0140) 0.0044 (0.0109) −0.0011 (0.0184) 100 5489
2006 0.0042 (0.0085) 0.0383** (0.0166) 0.0043 (0.0164) 0.0139 (0.0151) 94 5883
2007 0.0056 (0.0059) 0.0290** (0.0130) 0.0126 (0.0139) 0.0258* (0.0134) 100 5687
Knee 2005 −0.0005*** (0.0002) −0.0002 (0.0003) −0.0006* (0.0003)    1047 115,401
2006 −0.0007*** (0.0002) −0.0009*** (0.0003) −0.0012*** (0.0003) −0.0026*** (0.0010) 1008 122,150
2007 −0.0004*** (0.0002) −0.0003 (0.0003) −0.0006** (0.0002) −0.0005 (0.0008) 999 132,195
CABG 2005 −0.0011 (0.0046) −0.0008 (0.0086) −0.0064 (0.0078) 0.0012 (0.0105) 94 30,633
2006 −0.0009 (0.0050) 0.0004 (0.0070) −0.0037 (0.0081) −0.0021 (0.0099) 101 27,891
2007 −0.0103*** (0.0037) −0.0052 (0.0055) −0.0107* (0.0061) −0.0157* (0.0094) 98 27,644
  1. Note: The table shows the effect of case volume on mortality for different specifications of case volume. All regressions are estimated with the following covariates: age, male, charlson comorbidity index (1–2, 3–4, > = 5), admission reason (emergency, transfer), weekend/holiday admission, diagnosis specific main diagnoses, ownership (private not-for-profit, private for-profit), and university hospital. The tertiles divide the sample in three parts based on the case volume of hospitals. Hence, it is possible to distinguish patients treated in low, medium and high volume hospitals
  2. *Significant at 10%, **Significant at 5%, ***Significant at 1%