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Cross-sectional Study Coronary Heart Disease among Men and Women Aged 30-59 Years at Examination 1: Framingham Study (100\% participation) \begin{tabular}{|c|c|c|c|} \hline Age group & Population & Cases of CHD & $\begin{array}{c}\text { Prevalence Proportion per 1000 } \\ \text { population }\end{array}$ \\ \hline \hline $30-39$ & 1,869 & 8 & \\ \hline $40-49$ & 1,742 & 17 \\ \hline $50-59$ & 1,458 & 50 \\ \hline \hline Total, 30-59 & 5,069 & 75 & \\ \hline \hline \end{tabular} 1. Derive the prevalence proportion by age group in this table. For every 1,000 persons in the Framingham, aged $30-59$ years, you would expect to discover cases of CHD. 1. Compute and interpret the: - prevalence ratio - prevalence difference between 50-59 years and 40-49 years; between $50-59$ years and $30-39$ years of age.

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