Epidemiology: PUBH6035 Module2 Problem
Set
Epidemiology: PUBH6035 Module2 Problem Set
Question 1
Suppose that you are following a group of children for the
development of asthma over a one- year period. You identify 100
children on January 1st, screen them for asthma, and set up a
monitoring program to check on their status on a monthly basis.
Five children are considered prevalent cases because they were
diagnosed with asthma before January 1st. Ten children develop
asthma on March 1st and another ten children develop asthma on
July 1st. Another 10 children who remain healthy were followed
for six months and then were lost to follow-up. All of the
remaining children did not develop asthma and were not lost to
follow-up. Follow-up ended on December 31st.
· What was the prevalence of asthma on June 1st?
· What was the prevalence of asthma on September 1st?
· How many person-months of observation were accrued by this
population?
· What was the incidence rate of asthma in this population for the
one-year period?
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