Table 1

Number of procedures and number of procedures by the 25%, 50% and 75% percentile of the departments, January 2003–June 2008

Procedure	No of departments	No of procedures	25% percentile	Median 50% percentile	75% percentile
Arthroscopy	25	14 339	56	76	184
Knee endoprosthesis	71	43 180	47	97	264
Hip endoprosthesis	110	63 045	64	119	223