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Table 4 Measures of concentration for different product market definitions based on hospital system (mean)

From: Defining hospital markets – an application to the German hospital sector

  HHI MS CR3 NC NZIP Distance1) # of HS
Total 0.19 0.27 0.59 14.19 35.27 20.38 910
Standard procedures       
Nonsurgical procedures       
PNEU 0.34 0.46 0.74 8.41 23.53 12.23 759
STROKE 0.30 0.38 0.71 8.47 24.84 16.78 762
BIRTH 0.31 0.45 0.76 5.92 26.36 12.92 579
Surgical procedures       
APP 0.33 0.47 0.72 8.73 23.75 15.19 679
CHOL 0.34 0.48 0.75 8.02 24.73 12.02 687
Orthopaedic surgical procedures      
HAP 0.19 0.30 0.59 13.60 38.12 25.58 654
KAP 0.19 0.31 0.59 13.09 38.69 23.80 617
HIP 0.42 0.55 0.80 6.29 21.39 11.22 680
ORTHO 0.20 0.32 0.61 12.10 36.91 21.10 728
Complex surgical procedures      
AAA 0.44 0.60 0.85 6.11 21.97 26.51 305
CABG 0.56 0.70 0.92 1.58 61.96 50.97 62
  1. Notes: 1)Data was censored at the 99th percentile to eliminate extreme outliers. PNEU - pneumonia; APP - appendectomy; CHOL - cholecystectomy; HAP - hip arthroplasty; KAP - knee arthroplasty; HIP - hip fracture; ORTHO - joint category for HAP, KAP and HIP; AAA - intact abdominal aortic aneurysm; CABG - coronary artery bypass surgery.