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Answers for “为什么阳性预测值低于灵敏度?”

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The positive predictive value, or the probability of having the disease given a positive test result (P(D∣+)P(D \mid +)), is calculated by dividing the probability of a true positive by the total probability of a positive result. The total probability of a positive result includes both true positives and false positives.

Conditions: Prevalence P(D)=0.12P(D) = 0.12.; Sensitivity P(+∣D)=0.95P(+ \mid D) = 0.95.; False positive rate P(+∣Dc)=0.06P(+ \mid D^c) = 0.06.; The events are mutually exclusive and exhaustive for the disease status.