A Study Prospectively Examined Whether Sleep-Disordered Breathing Was Associated with an Increased

Multiple Choice

A study prospectively examined whether sleep-disordered breathing was associated with an increased risk of death from any cause in 6294 men and women participating in the Sleep Heart Health Study. Study participants were classified into four groups depending on the extent of their sleep-disordered breathing (none, mild, moderate, or severe) . The counts of deaths over the course of the study are reported for each group in the following two-way table:
$$\begin{array}{l}\begin{array} { | l | r r r r | } \hline &&& { \text { sleep-disordered breathing } } \\& \text { none } & \text { mild } & \text { moderate } & \text { severe } &\text { total } \\\hline \text { death } & 476 & 320 & 165 & 86 &1047\\\text { no death } & 2953 & 1477 & 562 & 255 &5247\\\hline \text { total } & 3429 & 1797 & 727 & 341 \\\hline\end{array}\\\begin{array} { l } \end{array}\end{array}$$ What is the proportion of subjects with no sleep-disordered breathing who died of any cause during the study?

A) 0.139
B) 0.161
C) 0.455
D) 0.545