1. A Clinical Study of COPD Severity Assessment by Primary Care Physicians and Their Patients Compared with Spirometry 
Douglas W. Mapel, MD, MPH, Anand A. Dalal, BPharm, PhD, MBA, Phaedra Johnson, MS, Laura Becker, MS, Alyssa Goolsby Hunter, MA 
The American Journal of Medicine 
Volume 128, Issue 6, Pages (June 2015)
DOI: /j.amjmed
Copyright © 2015 The Authors Terms and Conditions

2. Figure 1
COPD severity estimate by physicians (pre-test) versus spirometry. Patients* versus spirometry and physicians (pre-test) versus patients. *A total of 668 patients with spirometry results that could be rated for severity.
The American Journal of Medicine  , DOI: ( /j.amjmed )
Copyright © 2015 The Authors Terms and Conditions