Term	Definition	Mathematical Equation
Sensitivity	Probability of margins being positive on ultrasound if margins are truly positive histologically	True Positives/(True Positives+ False Negatives)
Specificity	Probability of margins being negative on ultrasound if margins are truly negative histologically	True Negatives/(True Negatives + False Positives)
Positive Predictive Value	Probability of having positive margins on histology given that the ultrasound was positive	True Positives/(True Positives+ False Positives)
Negative Predictive Value	Probability of having negative margins on histology given that the ultrasound was negative	True Negatives/(True Negatives + False Negatives)
Correct Classification	Probability of having positive margins on ultrasound and histology or negative margins on ultrasound and histology	(True Positives + True Negatives)/Total Number Pts