Consider the data table showing patients in a trial in which 30 are given a placebo and 20 are given an experimental drug and the deaths are recorded over a period of 24 months.

$\begin{array}{c}
\underline { \text { Control} } \quad \quad \quad \quad \quad \quad \quad \quad\underline { \text { Exp. drug}}\
\begin{array}{cccc}
\text { Time } & \text { \# at risk } & \text { Deaths } & \text { \# at risk } & \text { Deaths } \
3 & 30 & 5 & 20 & 1 \
6 & 25 & 6 & 18 & 2 \
9 & 19 & 3 & 16 & 1 \
12 & 16 & 3 & 15 & 2 \
24 & 13 & 2 & 13 & 1
\end{array}\end{array}$
-How many deaths were expected for the control group in the interval between 9 and 12 months after starting the trial?

Question

Consider the data table showing patients in a trial in which 30 are given a placebo and 20 are given an experimental drug and the deaths are recorded over a period of 24 months.
​
 $\begin{array}{c}
\underline {  \text {  Control}   }  \quad \quad \quad \quad \quad \quad \quad \quad\underline { \text { Exp. drug}}\
\begin{array}{cccc}
\text { Time } & \text { \# at risk } & \text { Deaths } & \text { \# at risk } & \text { Deaths } \
3 & 30 & 5 & 20 & 1 \
6 & 25 & 6 & 18 & 2 \
9 & 19 & 3 & 16 & 1 \
12 & 16 & 3 & 15 & 2 \
24 & 13 & 2 & 13 & 1
\end{array}\end{array}$
-How many deaths were expected for the control group in the interval between 9 and 12 months after starting the trial?

Quizplus · Accepted Answer

The expected number of deaths can be calculated using the formula: (Number at risk in control group / Total number at risk) * Total deaths in the interval. For the interval between 9 and 12 months, the calculation is: (16 / (16 + 15)) * 5 = 2.581.

Consider the Data Table Showing Patients in a Trial in Which