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Table 4 Number of hospitals and cases for total knee replacement interventions in 2006, 2008, and 2010 and number of cases per quintile

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 ≥ 1 855 905 949  
Change to 2006 - +5,8 % +11,0  
Annual no. of cases 114852 139287 143593  
Change to 2006 - +21,3 % +25 %  
  Min. – max. 1–979 1–1329 1–1367  
  Median 93,00 109,00 107,00  
  Mean (SD) 134,33 (126,7) 153,91 (144,1) 151,31 (140,4)  
Hospitals complying MVS*: 50 per year 745 (87,1 %) 834 (92,2 %) 870 (91,7 %)  
No. of cases in hospitals complying MVS 112305 (97,8 %) 137586 (98,8 %) 141597 (98,6 %)  
Hospitals not complying MVS 110 (12,9 %) 71 (7,8 %) 79 (8,3 %)  
No. of cases in hospitals not complying MVS 2547 (2,2 %) 1701 (1,2 %) 1996 (1,4 %)  
Quintile 1 hospitals 171 181 190  
No. of cases 56617 67795 69609 0,001**
 Percentage of annual cases 49,3 % 48,7 % 48,5 %  
  Min. – max. 191–979 215–1329 219–1367  
  Median 276,00 318,00 309,50  
  Mean (SD) 331,09 (153,4) 374,56 (181,9) 366,36 (177,0)  
Quintile 2 hospitals 171 181 190  
No. of cases 25650 30686 31322 <0,001**
 Percentage of annual cases 22,3 % 22,0 % 21,8 %  
  Min. – max. 117–190 133–215 130–218  
  Median 147,00 168,00 163,50  
  Mean (SD) 150,00 (21,3) 169,54 (24,3) 164,85 (23,7)  
Quintile 3 hospitals 171 181 189  
No. of cases 16051 19870 20635 <0,001**
 Percentage of annual cases 14,0 % 14,3 % 14,4 %  
  Min. – max. 75–116 89–153 91–130  
  Median 93,00 109,00 107,00  
  Mean (SD) 93,87 (11,9) 109,78 11,5) 109,18 (11,7)  
Quintile 4 hospitals 171 181 190  
No. of cases 10857 13302 14042 <0,001**
 Percentage of annual cases 9,5 % 9,6 % 9,8 %  
  Min. – max. 53–75 60–89 59–91  
  Median 63,00 74,00 73,00  
  Mean (SD) 63,49 (6,7) 73,49 (8,1) 73,91 (9,2)  
Quintile 5 hospitals 171 181 190  
No. of cases 5677 7634 7985 <0,001**
 Percentage of annual cases 4,9 % 5,5 % 5,6 % 0,999#
  Min. – max. 1–53 1–60 1–59  
  Median 40,00 51,00 51,00  
  Mean (SD) 33,20 (18,1) 42,18 (18,0) 42,03 (17,6)  
  1. *minimum volume standards; **Kruskal-Wallis-test; # chi-square-test