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Please forgive the error, but a sentence toward the middle of the fourth paragraph should read: Also, the more imperfect the test (the worse the sensitivity and specificity), the greater is the influence of the prior probability. David L. Doggett, Ph.D., Medical Research Analyst Health Technology Assessment and Information Service ECRI, a non-profit health services research organization 5200 Butler Pike, Plymouth Meeting, PA 19462 USA (610) 825-6000 ext 509, FAX (610) 834-1275 [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%