In a cohort of 3,000 employees working full-time as cashiers at the Piggly Wiggl
ID: 3435379 • Letter: I
Question
In a cohort of 3,000 employees working full-time as cashiers at the Piggly Wiggly, there were 760 ergonomic injuries to wrists during a 2-year time period. Among 5,000 people who are not employees of the Piggly Wiggly, there were 210 wrist injuries during the same time period. Calculate the relative risk of ergonomic injuries for cashiers compared to non-cashiers. Present to 1 decimal point.
The case-fatality rate is the percentage of persons diagnosed as having a specified disease who die as a result of that illness within a given period. Which country has the largest annual number of cerebrovascular disease DEATHS among new cases?
Country
Incidence Rate (per 10,000), 2010
Population, 2010
1-Year Case Fatality Rate (%)
A
10
50,000
50%
B
8
100,000
25%
C
4
250,000
20%
D
4
250,000
10%
Country
Incidence Rate (per 10,000), 2010
Population, 2010
1-Year Case Fatality Rate (%)
A
10
50,000
50%
B
8
100,000
25%
C
4
250,000
20%
D
4
250,000
10%
Explanation / Answer
First step is we draw a 2x2 table.
Obviously proportion for people working in Piggly Wiggly is more for wrist injuries than non Piggly wiggly
-------------------------------------------------------------------------------------------------------
Country
Incidence Rate (per 10,000), 2010
Population, 2010
1-Year Case Fatality Rate (%)
Deaths
col III * col V
A
10
50,000
50%
B
8
100,000
25%
C
4
250,000
20%
D
4
250,000
10%
Country A has the highest number of death of 25 for cerbrovascular diseases.
Ergonomic injuries yes no Total proportion for injury Piggly Wiggly yes 760 2240 3000 0.2533 No 210 4790 5000 0.042 Total 970 7030 8000 0.12125 Proportion for piggly 0.7835 0.3229 0.375