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.

$\begin{array}{c}\underline { \text { Diseased } } \quad \quad \quad \quad \quad \quad \quad \quad\underline { \text { Healthy}}\\\begin{array}{cccc}\text { Time } & \text { \# at risk } & \text { Deaths } & \text { \# at risk } & \text { Deaths } \\2 & 25 & 1 & 25 & 2 \\4 & 24 & 3 & 23 & 5 \\6 & 21 & 1 & 18 & 4 \\8 & 20 & 2 & 13 & 3 \\10 & 18 & 0 & 10 & 1 \\12 & 18 & 1 & 9 & 2\end{array}\end{array}$
-Based on the ?² value from a test of the hazard ratio for the disease group relative to the healthy group, what is our conclusion?

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}

-Based on the ?² value from a test of the hazard ratio for the disease group relative to the healthy group, what is our conclusion?

Quizplus · Accepted Answer

The p-value (denoted as ?²) from a test of the hazard ratio for the disease group relative to the healthy group being less than 0.05 (P < 0.05) indicates that there is a statistically significant difference between the survival curves of the diseased group and the healthy comparison group. This means that the likelihood of death over the 12-month period differs significantly between the two groups.

Consider the Data Table Showing Epidemiology Data for 25 Individuals