groups by cholesterol levels, high and low.  In 1950 there were 1120 people in the low cholesterol group, 20 of whom were found to have had a previous heart attack. Over the next 8 years (until the end of 1958) 66 more (new) heart attacks occurred in this group.  In 1950 among those in the high cholesterol group (n=1127) there were 27 that were shown to have had a previous heart attack. Over the next 8 years, (until the end of 1958) 135 new heart attacks occurred to members of this group.   What was the prevalence of heart attacks in the low cholesterol group in 1950?   What was the prevalence of heart attacks in the high cholesterol group in 1950?   What was the incidence rate of heart attacks in the low cholesterol group from 1951 until the end of 1958?

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groups by cholesterol levels, high and low.  In 1950 there were 1120 people in the low cholesterol group, 20 of whom were found to have had a previous heart attack. Over the next 8 years (until the end of 1958) 66 more (new) heart attacks occurred in this group.  In 1950 among those in the high cholesterol group (n=1127) there were 27 that were shown to have had a previous heart attack. Over the next 8 years, (until the end of 1958) 135 new heart attacks occurred to members of this group.

 

  1. What was the prevalence of heart attacks in the low cholesterol group in 1950?

 

  1. What was the prevalence of heart attacks in the high cholesterol group in 1950?

 

  1. What was the incidence rate of heart attacks in the low cholesterol group from 1951 until the end of 1958?
Expert Solution
Step 1

1. 20 people are in the 135 new heart attack low cholesterol group

20 of whom have had previous heart attack = 201120=0.017

2. 1127 people in high cholesterol group and 27 of them had previous attack

271127=0.023

 

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