1. Diameter-reflux relationship in perforating veins of patients with varicose veins 
João Luis Sandri, MD, Fanilda S. Barros, MD, Sandra Pontes, MD, Claudio Jacques, MD, Sergio X. Salles-Cunha, PhD 
Journal of Vascular Surgery 
Volume 30, Issue 5, Pages (November 1999)
DOI: /S (99)70011-X
Copyright © 1999 Society for Vascular Surgery and International Society Terms and Conditions

2. Fig. 1
Color flow duplex ultrasound scan of a medial calf perforating vein. Diameter was measured as the vein traversed the fascia. Flow is in the superficial-to-deep vein direction on the top and deep-to-superficial vein direction on the bottom (reflux).
Journal of Vascular Surgery  , DOI: ( /S (99)70011-X)
Copyright © 1999 Society for Vascular Surgery and International Society Terms and Conditions

3. Fig. 2
Cumulative predictive values for reflux in calf perforating veins. Cumulative negative- and positive-predictive values were calculated for diameters smaller than or larger than that plotted at the horizontal axis, respectively. NPV, negative-predictive value; PPV, positive predictive value.
Journal of Vascular Surgery  , DOI: ( /S (99)70011-X)
Copyright © 1999 Society for Vascular Surgery and International Society Terms and Conditions

4. Fig. 3
Interval predictive values for reflux in calf perforating veins. Interval positive- and negative-predictive values were calculated for 0.5 mm ranges around the center values plotted. NPV, negative-predictive value; PPV, positive-predictive value.
Journal of Vascular Surgery  , DOI: ( /S (99)70011-X)
Copyright © 1999 Society for Vascular Surgery and International Society Terms and Conditions