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Sensitivity: “ . . . probability that a diseased individual will have a positive test result” (Knapp and Miller, 1992).  Formula: P (T ^{+} / D ^{+}) OR A / (A + C)  Confidence Intervals for proportions: “ . . . the level of confidence (95%) that the calculated interval encompasses the true proportion in the populations from which the samples were drawn”. Expected proportions (p * q) are represented by the proportion of interest (p) and remaining proportion (q).  Formula: CI = “proportion” ± 1.96 x (p x q)/N 