The following table summarizes the findings of a cohort study.Participants were enrolled in January 1,2015,and followed up until December 31,2015.Researchers were interested in the effect of physical activity on cardiovascular disease. $752,9253,000\begin{array} { | l | c | c | c | } \hline & \text { Cardiovascular events } & \text { No events } & \text { Total } \\\hline \text { Physically active } & 28 & 1,972 & 2,000 \\\hline \text { Inactive } & 75 & 2,925 & 3,000 \\\hline\end{array}$ Based on the previous information,calculate the incidence per 1,000 per year of cardiovascular events among those who were categorized as physically active.

A) 14/1,000 per year
B) 25/1,000 per year
C) 28/1,000 per year
D) 75/1,000 per year
E) 99/1,000 per year

Question

The following table summarizes the findings of a cohort study.Participants were enrolled in January 1,2015,and followed up until December 31,2015.Researchers were interested in the effect of physical activity on cardiovascular disease.

752,9253,000\begin{array} { | l | c | c | c | } \hline & \text { Cardiovascular events } & \text { No events } & \text { Total } \\\hline \text { Physically active } & 28 & 1,972 & 2,000 \\\hline \text { Inactive } & 75 & 2,925 & 3,000 \\\hline\end{array}

Based on the previous information,calculate the incidence per 1,000 per year of cardiovascular events among those who were categorized as physically active.

A) 14/1,000 per year
B) 25/1,000 per year
C) 28/1,000 per year
D) 75/1,000 per year
E) 99/1,000 per year

Emily Quesada · Accepted Answer

Final Answer : A, Explanation :   The incidence rate is calculated as the number of new cases (28 cardiovascular events among the physically active) divided by the total number of individuals at risk (2,000 physically active individuals), then multiplied by 1,000 to get the rate per 1,000 per year. Thus,   28 2000 × 1000 = 14  \frac{28}{2000} 	imes 1000 = 14  2000 28 ​ × 1000 = 14   per 1,000 per year.

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