Consider the data table showing epidemiology data for 25 individuals with a disease and 25 healthy comparison individuals. Their deaths are recorded over a period of 12 months.

$\begin{array}{c}
\underline { \text { Diseased } } \quad \quad \quad \quad \quad \quad \quad \quad\underline { \text { Healthy}}\
\begin{array}{cccc}
\text { Time } & \text { \# at risk } & \text { Deaths } & \text { \# at risk } & \text { Deaths } \
2 & 25 & 1 & 25 & 2 \
4 & 24 & 3 & 23 & 5 \
6 & 21 & 1 & 18 & 4 \
8 & 20 & 2 & 13 & 3 \
10 & 18 & 0 & 10 & 1 \
12 & 18 & 1 & 9 & 2
\end{array}\end{array}$
-What proportion of individuals died during the interval between 6 and 8 months after starting the trial?

Question

Consider the data table showing epidemiology data for 25 individuals with a disease and 25 healthy comparison individuals. Their deaths are recorded over a period of 12 months.
​
 $\begin{array}{c}
\underline {  \text {  Diseased }   }  \quad \quad \quad \quad \quad \quad \quad \quad\underline { \text { Healthy}}\
\begin{array}{cccc}
\text { Time } & \text { \# at risk } & \text { Deaths } & \text { \# at risk } & \text { Deaths } \
2 & 25 & 1 & 25 & 2 \
4 & 24 & 3 & 23 & 5 \
6 & 21 & 1 & 18 & 4 \
8 & 20 & 2 & 13 & 3 \
10 & 18 & 0 & 10 & 1 \
12 & 18 & 1 & 9 & 2
\end{array}\end{array}$
-What proportion of individuals died during the interval between 6 and 8 months after starting the trial?

Quizplus · Accepted Answer

To find the proportion of individuals who died during the interval between 6 and 8 months, we need to look at the deaths in both the Diseased and Healthy groups during that time. From 6 to 8 months, 2 individuals died in the Diseased group, and 3 died in the Healthy group. The total number at risk at the beginning of this interval was 20 in the Diseased group and 13 in the Healthy group, making a total of 33 individuals at risk. The proportion of individuals who died is therefore $\frac{2+3}{33} = \frac{5}{33} \approx 0.152$.

Consider the Data Table Showing Epidemiology Data for 25 Individuals