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.

$\begin{array}{c}
\underline { \text { Control} } \quad \quad \quad \quad \quad \quad \quad \quad\underline { \text { Exp. drug}}\
\begin{array}{cccc}
\text { Time } & \text { \# at risk } & \text { Deaths } & \text { \# at risk } & \text { Deaths } \
3 & 30 & 5 & 20 & 1 \
6 & 25 & 6 & 18 & 2 \
9 & 19 & 3 & 16 & 1 \
12 & 16 & 3 & 15 & 2 \
24 & 13 & 2 & 13 & 1
\end{array}\end{array}$
-One patient dropped out of the study. Which of the following is a possible month during which they withdrew?

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.
​
 $\begin{array}{c}
\underline {  \text {  Control}   }  \quad \quad \quad \quad \quad \quad \quad \quad\underline { \text { Exp. drug}}\
\begin{array}{cccc}
\text { Time } & \text { \# at risk } & \text { Deaths } & \text { \# at risk } & \text { Deaths } \
3 & 30 & 5 & 20 & 1 \
6 & 25 & 6 & 18 & 2 \
9 & 19 & 3 & 16 & 1 \
12 & 16 & 3 & 15 & 2 \
24 & 13 & 2 & 13 & 1
\end{array}\end{array}$
-One patient dropped out of the study. Which of the following is a possible month during which they withdrew?

Quizplus · Accepted Answer

The patient could have withdrawn at any time between the recorded intervals. Since the number of patients at risk decreases by more than the number of deaths between months 3 and 6, it indicates a dropout during this period.

Consider the Data Table Showing Patients in a Trial in Which