1. Outcomes and Costs for Major Lung Resection in the United States: Which Patients Benefit Most From High-Volume Referral? 
Elliot Wakeam, MD, MPH, Joseph A. Hyder, MD, PhD, Stuart R. Lipsitz, PhD, Gail E. Darling, MD, FRCSC, Samuel R.G. Finlayson, MD, MPH 
The Annals of Thoracic Surgery 
Volume 100, Issue 3, Pages (September 2015)
DOI: /j.athoracsur
Copyright © 2015 The Society of Thoracic Surgeons Terms and Conditions

2. Fig 1
Adjusted volume-mortality relationship, by patient strata. Darkest blue bars indicate low volume; dark blue, moderate volume; medium blue, high volume; and light blue, very high volume. Asterisk (*) denotes significant trend. No significant trend is noted for patients in the 60 to 70 age group or in the less than 60 age group. (COPD = chronic obstructive pulmonary disease.)
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )
Copyright © 2015 The Society of Thoracic Surgeons Terms and Conditions

3. Fig 2
Adjusted cost-volume relationship, by patient strata. Darkest red bars indicate low volume; dark red, moderate volume; medium red, high volume; and light red, very high volume. (COPD = chronic obstructive pulmonary disease.)
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )
Copyright © 2015 The Society of Thoracic Surgeons Terms and Conditions

4. Fig 3
Cost-volume relationships. Dark gray bars indicate low volume; light gray, moderate volume; medium gray, high volume; and darkest gray, very high volume. (COPD = chronic obstructive pulmonary disease.)
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )
Copyright © 2015 The Society of Thoracic Surgeons Terms and Conditions