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Table 3 Overall statistics of all referral paths in 2006-2011

From: Referral paths in the U.S. physician network

Year

2006

2007

2008

2009

2010

2011

#referral paths

4.44M

4.45M

4.54M

4.59M

4.63M

4.66M

Avg length

3.850

3.907

3.983

4.023

4.061

4.115

Avg gap for a referral

8.509

8.506

8.369

8.352

8.230

8.060

Avg time range

24.247

24.727

24.969

25.245

25.192

25.109

Percent of paths with recurrent nodes

33.418

32.879

32.836

32.784

32.573

32.301

Avg #nodes before recurrence

4.087

4.130

4.179

4.196

4.223

4.271

Avg physician entropy

1.400

1.410

1.423

1.427

1.436

1.448

Avg hospital entropy

0.475

0.473

0.476

0.459

0.480

0.481

Avg HRR entropy

0.107

0.109

0.108

0.105

0.112

0.116

Avg bidirectional pairs in a path

0.450

0.455

0.465

0.474

0.476

0.479