Sensitivity and Specificity
Sensitivity and specificity were calculated by pre-determined rules whereby true positive linkage represent a prodrome followed by an attack. Sensitivity of the prodrome as a predictor of attack was 89.5%, Specificity 63.1%, Positive Predictive Value was 75.0% and Negative Predictive Value = 83.0%. These findings support our basic theory regarding the utility of prodromes as predictors of oncoming attacks.