WHAT IS THE CUMULATIVE INCIDENCE OF CVD OVER 10 YEARS? CUMULATIVE INCIDENCE 10 YEARS =

One thousand people are enrolled in a 10-year cohort study. At the start of the study, 100 have
diagnosed CVD. Over the course of the study, 80 people who were free of CVD at baseline
develop CVD.

1. What is the cumulative incidence of CVD over 10 years?
Cumulative Incidence 10 Years =
2. What is prevalence of CVD at baseline?
Prevalence Baseline =
3. What is the prevalence of CVD at 10 years?
Prevalence 10 Years =

A study is deigned to investigate whether there is a difference in response to various
treatments in patients with rheumatoid arthritis. The outcome is a patients self-reported
effect of treatment. The data are shown above. Are symptoms independent of treatment?
Conduct a Chi Square test at a 5% level of significance.
1.
Symptoms
No effect
Symptoms
total
df=
worsened
improved
2.
Treament1
22
14
14
50

Treatment 2
14
15
21
50
Treatment 3
9
12
29
50
Critical value
3. Computed statistic
Based on comparing the computed statistics to the critical value which of the following are true?
a. There is significant evidence , alpha 0=0.05, to show that treatment and response are not
independent
b. There is not significant evidence, alph=0.05, to show that treatment and response are not
independent
c. There is significant evidence, alpha =0.05, to show that treatment and response are
independent
d. B and c

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