92296: Fundamentals of Epidemiology - Stratum-Specific Risk Ratios - Epidemiology Assignment Help

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Question 1 

A cohort study of people who were admitted to hospital for a stroke looked at the association between admission to hospital on weekdays (Monday to Friday) or the weekend (Saturday and Sunday) with in-hospital mortality. The data from the study are reported in Table 1 below. In this question, provide all working for your calculations.


1. Calculate the risk ratio for in-hospital mortality to compare mortality by admission period.

2. What was the (absolute) difference in mortality rates by the admission period? Interpret your answer.

3. Now calculate the attributable fraction associated with a weekend admission. Give an interpretation of your answer. 

4. Calculate the population attributable risk for weekend admissions. Give an interpretation of your answer.

5. Now calculate and interpret the population attributable fraction for weekend admissions. 

6. Summarise the findings from 1 to 5 in a paragraph. 

7. What further information would you wish to know to assess the validity of your conclusions?

Table 2: In-hospital mortality, by admission period (weekday or weekend), among people  admitted to hospital for a stroke

(a) Age < 65 years 


1. Calculate the stratum-specific risk ratios. 

2. Using 1, discuss whether the age-group is an effect modifier. 


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