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Table 5 Number of hospitals and cases for kidney transplantations in 2006, 2008, and 2010 and number of cases per tercile

From: Minimum volume standards in German hospitals: do they get along with procedure centralization? A retrospective longitudinal data analysis

  2006 2008 2010 p
Hospitals with no. of cases ≥ 1 40 40 37  
Change to 2006 - 0,0 % −7,5 %  
Annual no. of cases 2784 2784 2856  
Change to 2006 - 0,0 % +2,6 %  
  Min. – max. 4–251 9–255 12–264  
  Median 57,50 60,50 69,00  
  Mean (SD) 69,60 (48,4) 69,60 (48,7) 77,19 (51,7)  
Hospitals complying MVS*: 25 per year 38 (95 %) 36 (90,0 %) 35 (94,6 %)  
No. of cases in hospitals complying MVS 2769 (99,5 %) 2721 (97,7 %) 2824 (98,9 %)  
Hospitals not complying MVS 2 (5,0 %) 4 (10,0 %) 2 (5,4 %)  
No. of cases in hospitals not complying MVS 15 (0,5 %) 63 (2,3 %) 32 (1,1 %)  
Tercile 1 hospitals 13 13 12  
No. of cases 1581 1597 1598 0,438**
 Percentage of annual cases 56,8 % 57,3 % 56,0 %  
  Min. – max. 85–251 86–255 96–264  
  Median 105,00 107,00 117,00  
  Mean (SD) 121,62 (48,3) 122,85 (47,5) 133,17 (51,0)  
Tercile 2 hospitals 14 14 13  
No. of cases 837 830 883 0,288**
 Percentage of annual cases 30,1 % 29,8 % 30,9 %  
  Min. – max. 39–84 39–84 40–94  
  Median 57,50 60,50 69,00  
  Mean (SD) 59,79 (16,1) 59,29 (15,1) 67,92 (15,6)  
Tercile 3 hospitals 13 13 12  
No. of cases 366 357 375 0,433**
 Percentage of annual cases 13,1 % 12,8 % 13,1 % 0,999#
  Min. – max. 4–38 9–38 12–39  
  Median 32,00 30,00 33,50  
  Mean (SD) 28,15 (10,4) 27,46 (9,0) 31,25 (8,0)  
  1. *minimum volume standards; **Kruskal-Wallis-test; # chi-square-test