Statistics and Biostatistics help needed
Statistics and Biostatistics help needed
Question 1 Recently, Australian researchers conducted a study of the relationship between optimism and colon cancer survival. Their hypothesis was that colon cancer patients who had a positive outlook on life would have a lower five-year cumulative incidence of mortality. The study included 100 recently diagnosed colon cancer patients who underwent psychological testing and were found to have a optimistic outlook on life and 100 recently diagnosed colon cancer patients who underwent the same psychological tests and were found to have a pessimistic outlook on life. By the end of five years of follow-up, 50 of the 100 patients with the optimistic outlook and 75 of the 100 patients with the pessimistic outlook had died from colon cancer. • Set up and fill in the two by two table using these data. • What is the prevalence of colon cancer in the study population? • Compare the cumulative incidence of mortality in the optimistic group to the cumulative incidence of mortality in the pessimistic group using a ratio measure of association. • State in words your interpretation of the result you found in part c.
For this problem, note the following chart:
Age Group |
% of Population in Age Group |
Influenza Rate per 1,000 person-years |
|||||
CITY A |
CITY B |
CITY C |
Massachusetts |
CITY A |
CITY B |
CITY C |
|
YOUNG |
40% |
50% |
80% |
60% |
2 |
10 |
30 |
OLD |
60% |
50% |
20% |
40% |
70 |
110 |
5 |
There are 10,000 individuals in City A, which is located in Massachusetts. Eight young individuals and 420 old individuals develop the flu over the course of a year.
- Use these data to calculate the crude influenza rate per 1,000 individuals per years in City A.
- What is the crude rate of influenza in City B?
- What is the crude rate of influenza in City C?
- Calculate an age-adjusted influenza rate for each of the cities. Use the age distribution for the State of Massachusetts (shown in the table) as the standard.