Positive predictive value (PPV) is the probability that individuals with a positive test result actually have the disease or condition being tested for. This measure is crucial in evaluating the effectiveness of diagnostic tests and screening programs, as it helps determine the reliability of positive results and informs public health decisions. A high PPV indicates that a positive test result is likely accurate, while a low PPV suggests that false positives may be common, affecting the overall trust in screening methods.
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