One more time with this graph! Use what you learned in the last recording to practice how you would calculate period prevalence - what is the period prevalence for the years 6-8 of the study? Note that none of the study participants had experienced the event BEFORE they enrolled in the study. Key: X = experienced event o = loss to follow up
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In this case, we are looking at the period prevalence for the years 6-8. Show more…
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Problem 2 (1.5 points, 0.5 point each) Date of onset of illness Date of death Date of recovery Person # 1 2 3 4 5 6 7 8 9 10 Oct. 1, 1990 Apr. 1, 1991 Sep. 30, 1991 The figure above represents ten episodes of an illness in a population of 20 over a period of 16 months. Each horizontal line represents the portion of time one person spends being ill. The line begins on the date of onset and ends on the date of death or recovery. Calculate the following rates: a. Point prevalence on October 1, 1990 6/20 b. Period prevalence, October 1, 1990 to September 30, 1991 c. Cumulative incidence from October 1, 1990 to September 30, 1991
Sri K.
Question 2 1. A study on diabetes begins with one thousand 40 to 45-year-old men of which 60 are already diabetic. The remaining 940 men are followed for 5 years during which time 75 men develop diabetes. Calculate the prevalence of diabetes at the start of the study. Please express the answer in a percentage to 2 decimal places without the % symbol. For example, for a prevalence of 0.025 or 2.5%, enter the number 2.50. No other text is required. 2. Consider a class with 80 enrolled students. None of the students were ill at the beginning of the school year. On August 30th, 10 students reported having a common cold. All continued to be ill on September 1st, but all 10 recovered within 3 days. On September 15th, 5 more students had a cold. All of these students continued to be ill on September 16th, but all recovered 5 days later. In this example, assume that a person cannot have a cold more than once: Calculate the prevalence of the common cold in the class on September 1st. Please express the answer in a percentage to 2 decimal places without the % symbol. For example, for a prevalence of 0.025 or 2.5%, enter the number 2.50. No other text is required.
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A prospective study with a 2-year (24-month) follow-up was conducted. Results are shown in the table for individuals who either died or were censored before the end of the follow-up period. Below is the survival data for 20 participants of hypothetical prospective study. Using the table above: follow up time (months) | event 2 | death 4 | censored 7 | censored 8 | death 12 | censored 15 | death 17 | death 19 | death 20 | censored 23 | death Calculate for all deaths (a -e): a.the probability of death at the exact time when each death occurred. b.the probability of survival beyond the time when each death occurred. c.the cumulative probabilities of survival d.What is the cumulative incidence at the end of the follow-up period? e.What is the cumulative survival probability at the end of the follow-up period?
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