Question

1000 patients interviewed. 300 had high enough score that more investigation was required and of those, 200 did have problems with alcohol use. 65 patients with problem drinking were missed by the test. what is the PPV?

What is the definition of a PPV?

Answer 1

The Positive Predictive Value (PPV) in this medical scenario is 67%, indicating that when the test identifies a patient as requiring further investigation for alcohol use, there is a 67% chance the patient does indeed have a problem with alcohol use.

Step-by-step explanation:

The Positive Predictive Value (PPV) is a measure of how often a positive test correctly identifies a condition. The Positive Predictive Value (PPV) in this medical scenario is 67%, indicating that when the test identifies a patient as requiring further investigation for alcohol use, there is a 67% chance the patient does indeed have a problem with alcohol use.

In this scenario with the alcohol use screening, the PPV can be calculated using the formula: PPV = (True Positives) / (True Positives + False Positives). There were 200 true positives (patients who had problems with alcohol use and were identified by the test) and 100 false positives (300 identified as requiring investigation minus the 200 true positives). Therefore, the PPV is 200 / (200 + 100) = 200 / 300 = 0.67 or 67%.