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Table 4: The frequency of CSF diversion surgery and the predicted frequency by stepwise logistic regression^{^a}
Observed Predicted % Correct
Yes No
Yes 11 3 78.6
No 2 17 89.5
Overall % correct 84.8
↵a Cutoff = 0.5; sensitivity = 11/(11 + 3) = 78.6%; specificity = 17/(2 + 17) = 89.5%; false-positive = 2/(2 + 17) = 10.5%; false-negative = 3/(11 + 3) = 21.4%.
Observed	Predicted		% Correct
Observed	Yes	No	% Correct
Yes	11	3	78.6
No	2	17	89.5
Overall % correct			84.8