Epidemiologists tried to investigate the role of factor Y in the exposure-disease relationship.They developed three tables to show the exposure-disease relationship based on the status of factor Y.Based on the information given,what is the role of factor Y in the exposure-disease relationship? Overall $\begin{array}{|l|l|l} & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 1,000 & 500 \\ \hline \text { Unexposed } & 200 & 500 \end{array}$ Factor Y present $\begin{array}{|l|l|l} & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 800 & 250 \\ \hline \text { Unexposed } & 100 & 250 \end{array}$ Factor Y absent $\begin{array}{|l|l|l} & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 200 & 250 \\ \hline \text { Unexposed } & 100 & 250 \end{array}$

A) Factor Y is a confounder. B) Factor Y is an effect measure modifier. C) Factor Y is a mediator. D) Factor Y is an outcome. E) Factor Y does not have any role in the exposure-disease relationship. A) Factor Y is a confounder. B) Factor Y is an effect measure modifier. C) Factor Y is a mediator. D) Factor Y is an outcome. E) Factor Y does not have any role in the exposure-disease relationship. B

Epidemiologists tried to investigate the role of factor Y in the exposure-disease relationship.They developed three tables to show the exposure-disease relationship based on the status of factor Y.In this analysis,what is the odds ratio in the overall population?$\text { Overall }$ $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 1,000 & 500 \\ \hline \text { Unexposed } & 200 & 500\\ \hline \end{array}$ $\text { Factor } Y \text { present }$ $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 800 & 250 \\ \hline \text { Unexposed } & 100 & 250 \\ \hline \end{array}$ $\text { Factor } Y \text { absent }$ $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 200 & 250 \\ \hline \text { Unexposed } & 100 & 250 \\ \hline \end{array}$

A) 0.5 B) 1.0 C) 2.0 D) 5.0 E) 8.0 A) 0.5 B) 1.0 C) 2.0 D) 5.0 E) 8.0

Epidemiologists tried to investigate the role of factor Z in the exposure-disease relationship.They developed three tables to show the exposure-disease relationship based on the status of factor Z.Based on the information given,what is the role of factor Z in the exposure-disease relationship?Overall $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 1,050 & 500 \\ \hline \text { Unexposed } & 300 & 700 \\ \hline \end{array}$ Factor X present $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 700 & 250 \\ \hline \text { Unexposed } & 200 & 350 \\ \hline \end{array}$ Factor X absent $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 350 & 250 \\ \hline \text { Unexposed } & 100 & 350 \\ \hline \end{array}$

A) Factor Z is a confounder. B) Factor Z is an effect measure modifier. C) Factor Z is a mediator. D) Factor Z is an outcome. E) Factor Z does not have any role in the exposure-disease relationship. A) Factor Z is a confounder. B) Factor Z is an effect measure modifier. C) Factor Z is a mediator. D) Factor Z is an outcome. E) Factor Z does not have any role in the exposure-disease relationship.

Epidemiologists tried to investigate the role of factor X in the exposure-disease relationship.They developed three tables to show the exposure-disease relationship based on the status of factor X.Based on the information given,what is the role of factor X in the exposure-disease relationship? $\text { Overall }$ $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 1,000 & 500 \\ \hline \text { Unexposed } & 200 & 500\\ \hline \end{array}$ $\text { Factor } Y \text { present }$ $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 800 & 250 \\ \hline \text { Unexposed } & 100 & 250 \\ \hline \end{array}$ $\text { Factor } Y \text { absent }$ $\begin{array}{|l|l|l|} \hline & \text { Case } & \text { Control } \\ \hline \text { Exposed } & 200 & 250 \\ \hline \text { Unexposed } & 100 & 250 \\ \hline \end{array}$

A) Factor X is a confounder. B) Factor X is an effect measure modifier. C) Factor X is a mediator. D) Factor X is an outcome. E) Factor X does not have any role in the exposure-disease relationship. A) Factor X is a confounder. B) Factor X is an effect measure modifier. C) Factor X is a mediator. D) Factor X is an outcome. E) Factor X does not have any role in the exposure-disease relationship.