In the Hypothetical Example That Follows, Patients Coming into a Clinic

In the hypothetical example that follows, patients coming into a clinic with disease symptoms are classified as having varying degrees of severity, from Stage 0 to Stage 4. Stage 4 represents the most severe symptoms; Stage 0 includes those with symptoms only but not the disease. The available treatment is expected to benefit those groups differently, and add extra years of life to each person as shown in the Gain (each person) row in the table. Please answer questions 5 through 7.
? $\begin{array}{|l|l|l|l|l|l|l|}\hline & \text {Stage 4 }& \text {Stage 3} & \text { Stage 2} & \text {Stage 1 }& \text {Stage 0 }& \quad\\\hline \text { Gain (each person) }& 45 & 30 & 4 & 1 & 0 & \\\hline \text {Number of persons coming to clinic }& 4 & 4 & 12 & 20 & 60 & \\\hline\end{array}$

-Marginal analysis shows that more than 80% of the total gains are realized by treating only the sickest patients, Stage 4 and Stage 3 patients.

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