1. Relationship of severity of lower limb peripheral vascular disease to mortality and morbidity: A six-year follow-up study 
Mary A. Howell, MD, Mary Paula Colgan, MD, Richard W. Seeger, MD, Don E. Ramsey, MD, David S. Sumner, MD 
Journal of Vascular Surgery 
Volume 9, Issue 5, Pages (May 1989)
DOI: /S (89)
Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

2. Fig. 1
Cumulative survival rate for each disease category. Survival rates for group IV are significantly different from those of the other groups (p < 0.05). Numbers entering intervals are shown on the graph. Range of standard errors of cumulative survival: group I, 2% to 4%; group II, 2% to 5%; group III, 5% to 8%; and group IV, 8% to 10%.
Journal of Vascular Surgery 1989 9, DOI: ( /S (89) )
Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions