Parameters:
(1) score of Sassone et al
(2) blood flow and resistance index (RI)
|
Parameter
|
Finding
|
Points
|
|
score of Sassone et al
|
< 9 (not suspicious)
|
0
|
|
|
>= 9 (suspicious)
|
1
|
|
blood flow
|
none
|
0
|
|
|
flow with resistance index > 0.45
|
0
|
|
|
flow with RI <= 0.45
|
1
|
value of X =
= (4.263 * (points for Sassone score)) + (3.095 * (points for blood flow)) - 5.002
probability of a malignant adnexal mass =
= 1 / (1 + EXP((-1) * X))
Interpretation:
• The minimum probability was 1%.
• The maximum probability was 91%.
• An adnexal mass with a probability >= 75% was interpreted as being probably malignant.
• An adnexal mass with a probability < 75% was assumed to be benign.
Performance:
• 2 of 13 malignant tumors had a probability < 75%.
• None of the benign tumors had a probability >= 75%.
• The sensitivity was 85% and specificity 100%.
• The positive predictive value was 100% while the negative predictive value was 96%.
