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For Questions 19-20 use the following information: You are the principal investigator of a four-year survival study. Unfortunately, your new research assistant went on vacation

For Questions 19-20 use the following information:

You are the principal investigator of a four-year survival study. Unfortunately, your new research assistant went on vacation without filling in the important calculation fields in the life table below. In order to discover how effective your study was, you must fill out the ACTUARIAL life table and interpret the data.

Table 4.

Interval since start of study

Number alive at start of interval

Number who were censored during interval e.g., (lost to follow-up, etc)

Adjusted number at risk during interval (Number alive at midpoint)

Number who died during interval

Proportion who died during interval

Proportion who survived during interval

Cumulative proportion who survived from enrollment to end of interval

(Cumulative survival)

1st year

100

5

Question 19

4

2nd year

91

3

7

3rd year

81

3

6

4th year

72

5

9

Question 20

Question 19

What is the adjusted number at risk at 1st year since the start of the study? Report your answer rounded to the 10th decimal place.

_________________________

Question 20

What is the cumulative survival at the end of the 4th year among participants of this study (using the life table)? Please give your answer as a percentage (multiply by 100) rounded to the 10th decimal place. (i.e.: 14.1%)

___________________

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