1. Predictive power of penile/brachial index in diagnosing male sexual impotence 
Ray C.-J Chiu, M.D., Ph.D., F.R.C.S.C., Donna Lidstone, R.N., Peter E. Blundell, M.D., F.R.C.S.C. 
Journal of Vascular Surgery 
Volume 4, Issue 3, Pages (September 1986)
DOI: / (86)
Copyright © 1986 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

2. Fig. 1
Probability of organic impotence (no nocturnal erection) at various levels of penile/brachial (P/B) index. Patients were divided into four groups according to their risk factors. PVD = peripheral vascular disease; Diab = diabetes mellitus.
Journal of Vascular Surgery 1986 4, DOI: ( / (86) )
Copyright © 1986 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

3. Fig. 2
Probability of clinical impotence (no penetration) at various levels of penile/brachial (P/B) index. Patients divided into four groups according to their risk factors. PVD = peripheral vascular disease; Diab = diabetes mellitus.
Journal of Vascular Surgery 1986 4, DOI: ( / (86) )
Copyright © 1986 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

4. Fig. 3
Hypothetical chart depicts two extremes of diagnostic power of a test. The “non-diagnostic” example shows incidence of impotence unchanged at all levels of penile/brachial index (PBI), whereas the “diagnostic” example shows clear cut-off point in PBI, with marked difference in incidence of impotence above and below this PBI level.
Journal of Vascular Surgery 1986 4, DOI: ( / (86) )
Copyright © 1986 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions