HW 3 .docx

# HW 3 .docx - QUESTION 1 1 Chapter 6 Gordis Pages 128-130...

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QUESTION 1 1. Chapter 6 Gordis Pages 128-130 Which of the following is a good index of the severity of a short-term, acute disease? Cause-specific death rate 5-year survival Case-fatality rate Standardized mortality rate None of the above 1 points QUESTION 2 1. Number of Patients alive on each anniversary Year of treatment No. of patients treated 1st 2nd 3rd 1991 1992 1993 75 63 42 60 55 37 56 31 48 total 180 152 87 48 2. 3. One hundred eighty patients were treated for disease X from 1991 to 1993, and their progress was followed to 1994. The treatment results are given in the table. No patients were lost to follow-up. 4. 1. What is the probability of surviving for 3 years? 0.549 or 54.9% 1 points QUESTION 3 1. An important assumption in this type of analysis is that: (from previous question) Treatment has improved during this period of the study The quality of record-keeping has improved during the period of the study No change has occurred in the effectiveness of the treatment during the period of the study An equal number of men and women were enrolled each year None of the above 1 points QUESTION 4 1. A diagnostic test has been introduced that will detect a certain disease 1 year earlier than it is usually detected. Which of the following is most likely to happen to the disease within 10 years after the test is introduced? (Assume that early detection has no effect on the natural history of the disease. Also assume that no changes in death certification practices occur during the 10 years.)

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The period prevalence rate will decrease The apparent 5-year survival rate will increase The age-adjusted mortality rate will decrease The age-adjusted mortality rate will increases The incidence rate will decrease 1 points QUESTION 5 1. Which of the following statements about relative survival is true? It refers to survival of first-degree relatives It is generally closer to observed survival in elderly populations It is generally closer to observed survival in young populations It generally differs from observes survival by a constant amount, regardless of age None of the above 1 points QUESTION 6 1. The data were obtained from a study of 248 patients with AIDS who were given a new treatment and followed to determine survival. The study population was followed for 36 months. Note: Carry your calculations in the table to four decimal places, but give the final answer to three decimal places. Survival of patients with AIDS after Diagnosis (1) Interval since Beginnin g Treatme nt (months) (2) Alive at beginnin g of interval (3) Died during interval (4) Withdre w during interval (5) Effective Number Exposed to Risk of Dying during Interval: Col (2)- 1/2 (Col (4)) (6) Proportio n Who Died during Interval: Col (3)/Col (5) (7) Proportio n Who Did Not Die during interval: 1-Col (6) (8) Cumulativ e proportio n Who survived from Enrollme nt to End of Interval: cumulativ e Survival X l X d x w x 1 l x q x p x P x 1-12 13-24 25-36 248 125 57 96 55 55 27 13 2 1. For those people who survived the second year, what is the probability of dying in the third year? 98.21% 1 points QUESTION 7
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