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- as an epidemiologist you are going to investigate the effect of lead exposure in a Baltimore neighborhood and the incidence of lead poisining and related difficulties in early childhood. You start with a cohort of 400 babies born in 2015. At baseline, none of them have any symptoms of lead poisining, but after taking envirnomental samples from their homes you find that 250 have lead paint exposure and 150 of them do not You follow them for ten years and keep track of incident cases of lead poisining based on blood samples. In 2025 you end your study and report the following: 100 of the children previously exposed to lead paint in 2015 have lead poisining and 25 of the children that were not exposed in 2015 have lead poisining. Calculate the cumulative incidence for the exposed group and the unexposed group. Calculate the relative risk between lead paint exposure and lead poisining.The Boston Globe reported last week that the Boston suburb of Chelsea, with 315 reported cases, had the highest per capita COVID-19 infection rate in Massachusetts at 79 infected per 10,000. (“Chelsea, city of the working Latino immigrant, emerges as a COVID-19 hotspot”). Using this per capita rate, find the total population of Chelsea.What is the reasoning for ALP values in young adults and chidlren being double the values of adults. Both of the populations are free of underlying disease?
- Accessibility to playgrounds and/or parks could potentially help reduce childhood obesity. As an epidemiologist, you intend to look into this relationship. To that end, you create a list of all cities in the state of Rhode Island. You note the prevalence of choldhood obesity for each city. For each city in RI, you also note the proportion of households with safe access to a park or a playground within 10 minute walking distance. This is an example of _________________________ study design a. Prospective cohort b. Ecological c. Cross-sectional d. Case control e. Retrospective cohortIn this fictitious example of a cohort study, we found that in a factory of 3,000 workers, 1,000 workers were exposed to toxic substances, and 2,000 were not. During the study period, 800 of the exposed workers developed some type of lung disease, and only 40 of the non-exposed workers developed a lung disease. C. What is the incidence of lung disease in exposed workers that can be attributed to being exposed to asbestos? Use the already rounded off answers in the previous items when computing and answer should be in whole numbers. D. What is the proportion of the total incidence of lung disease in those exposed workers that is attributable to asbestos? Use the already rounded off answers in the previous items when computing and answer should be in whole numbers.A researcher enrolled 100 subjects into a study on September 1, 2000. All of the subjects were at risk for developing Influenza A. On November 1, 2000, 10 subjects developed Influenza A. On December 1, 2000, 10 more subjects developed Influenza A. None of the remaining subjects developed Influenza A and none of these subjects left the study. The study ended on March1, 2001. Calculate the incidence density of Influenza A from September 1, 2000 to March 1, 2001. Show your work.
- in a village where hte proportion of individuals who are susceptible to malaria (genotype hbA/hbA) is 0.53 and hte population is asssumed to be at hardy weingberg equalibrium what is the expected freqency of the HbS alle? hint what is the genotype of people with sickle cell disease and how is that genotype represneted in the hardy weinberg equationCalculating Incidence versus Prevalence The picture represents 10 new cases of illness over about 15 months in a population of 20 persons. Each horizontal line represents one person. The down arrow indicates the date of onset of illness. The solid line represents the duration of illness. The up arrow and the cross represent the date of recovery and date of death, respectively. The picture New: Cases of Illness from October 1, 2004–September 30, 2005 Question: Calculate the incidence rate from October 1, 2004, to September 30, 2005, using the midpoint population (population alive on April 1, 2005) as the denominator. Express the rate per 100 population.All of the following are observational epidemiological studies, except a. Descriptive study b. Randomized controlled trial c. Case-control study d. Cross-sectional study e. Cohort study f. Ecological study
- In a cohort study, the ratio of the incidence rate of a disease in an exposed group to the incidence rate of the disease in a nonexposed group is the: a. Relative risk b. Risk difference c. Prevalence ratio d. Odds ratioVisis CDC website and report statistics for COVID-19 in any of the three states in USA. Define the words morbidity, mortality,reservoir, and vector. Link to cdc website https://www.cdc.gov/mmwr/index.htmlCalculating Incidence versus Prevalence The picture represents 10 new cases of illness over about 15 months in a population of 20 persons. Each horizontal line represents one person. The down arrow indicates the date of onset of illness. The solid line represents the duration of illness. The up arrow and the cross represent the date of recovery and date of death, respectively. The picture New: Cases of Illness from October 1, 2004–September 30, 2005 Question: Calculate the period prevalence from October 1, 2004, to September 30, 2005. The numerator of period prevalence includes anyone who was ill any time during the period. In Figure 3.1, the first 10 persons were all ill at some time during the period.