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Hiruni Dasanayake

Hiruni D.

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Questions asked

INSTANT ANSWER

Search for an HTA report on the topic using one other form of searching other than pubmed Policy question: Is the use of statins for secondary prevention - i.e. in people with cardiovascular disease - safe and effective at preventing subsequent cardiovascular events when compared to usual care? Population or patient group: Adults (aged ≥18 years) with cardiovascular disease (CVD), including coronary heart disease. This is a secondary prevention population. Intervention: Statins (lipid-lowering medicines). Specifically, any of the following – atorvastatin, fluvastatin, pravastatin, rosuvastatin, simvastatin Comparators: Placebo or ‘usual care’ or ‘non-statin treatment’ Outcomes: All-cause mortality, cardiovascular mortality, coronary heart disease mortality, stroke mortality, cardiovascular events, adverse events, health related quality of life.

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INSTANT ANSWER

1. Each student will conduct a PubMed search to find randomised controlled trials, systematic reviews and HTA reports that would likely address the PICO criteria below. The PubMed search strategy should be submitted, including the number of citations yielded at each line of the search. The results of the search (a snapshot of the first page of citations is sufficient) should also be submitted. The search strategy should have enough detail that it can be replicated. 2. Search for an HTA report on the topic using one other form of searching. Policy question: Is the use of statins for secondary prevention - i.e. in people with cardiovascular disease - safe and effective at preventing subsequent cardiovascular events when compared to usual care? Population or patient group: Adults (aged ≥18 years) with cardiovascular disease (CVD), including coronary heart disease. This is a secondary prevention population. Intervention: Statins (lipid-lowering medicines). Specifically, any of the following – atorvastatin, fluvastatin, pravastatin, rosuvastatin, simvastatin Comparators: Placebo or ‘usual care’ or ‘non-statin treatment’ Outcomes: All-cause mortality, cardiovascular mortality, coronary heart disease mortality, stroke mortality, cardiovascular events, adverse events, health related quality of life.

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INSTANT ANSWER

The height of young Australian male blood donors aged 18 - 24 years is thought to be Normally distributed with mean = μ and variance = σ 2. (i) Explain briefly how this assumption (of Normality) could be checked if researchers had access to a random sample of heights from 100 young adult male donors. (2 marks)

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ANSWERED

Danielle Fairburn verified

Numerade educator

8. Researchers were concerned about possible iron deficiency in infants with different feeding regimens. They surveyed all mothers and babies attending a clinic in a one month period, achieving 98% participation. Blood samples were obtained from infants. Haemoglobin levels (related to iron) of breast fed infants were compared to those of formula fed infants. A summary of the results for blood haemoglobin levels (g/dl) can be seen below. Group Breast fed Formula fed n mean 23 13.3 19 12.4 standard deviation 1.7 1.8 (a) State appropriate Null and Alternative hypotheses and explain why a one or two-sided Alternative hypothesis would be appropriate for this study. (b) The test statistic that we would make use of in this instance would have the form of either Q1 (iii) or (iv). Explain which we would choose in this example. (c) Calculating the test statistic gives us the result t = 1.663 and P-value = 0.104. If the type 1 error level is 0.05, explain what decision you would make with respect to your hypotheses. (d) An expert on iron deficiency says that the observed difference in mean haemoglobin levels is clinically meaningful. Explain whether this changes your conclusions in (c).

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INSTANT ANSWER

AIM: to assess the association between national death rates from mesothelioma due to historical consumption of asbestos, from countries with available data. METHODS: We calculated yearly age-adjusted mortality rates (deaths per million population per year) from mesothelioma from 2000-2004 and mean per head asbestos consumption (kg per person per year) in 1960-1969. We regressed death rates for mesothelioma against historical asbestos consumption, weighted by the size of national populations. RESULTS: Historical asbestos consumption was associated with an increased risk of death for mesothelioma among men (RR 2.4 (95%CI 2.0, 2.9)) and women (RR 1.6 (1.4, 1.9)) per unit consumption. INTERPRETATION: Within the constraints of this study, clear and plausible associations were shown between deaths from mesothelioma and historical asbestos consumption. These data support the recommendation that all countries should eliminate the use of asbestos. The value of study designs like this is: I. Reducing risk of recall bias Il. Investigating aggregate-level exposures that only make sense at the population level such as housing segregation Ill. Informing whether there are differences across countries in aggregate-level exposures II and III are correct Only III is correct All of the responses are correct Only I is correct

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INSTANT ANSWER

Researchers investigated whether the risk of cerebral palsy occurring in infants was associated with anemia experienced by the mother in early pregnancy. They conducted their study in South Australia from 1982 to 1984. A total of 140 infants with cerebral palsy took part in this study, of which 101 mothers reported anaemia in early pregnancy. The infants with cerebral palsy were compared to infants of a similar age, who were recruited through random sampling of the Births registry. They enrolled 2 comparison infants to every 1 infant who had cerebral palsy. Comparison infants were eligible if they were born without any birth defects and were conceived within 3 days of the date of birth for children with cerebral palsy. Of the comparison group of infants, 50 mothers reported anemia in early pregnancy. Which two of the following statements is true about this study? I. Anaemia in early pregnancy is the exposure II. Cerebral palsy is the exposure III. Anaemia in early pregnancy is the outcome IV. Cerebral palsy is the outcome Group of answer choices II & IV II & III I & IV I & III

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INSTANT ANSWER

Researchers investigated whether the risk of cerebral palsy occurring in infants was associated with anemia experienced by the mother in early pregnancy. They conducted their study in South Australia from 1982 to 1984. A total of 140 infants with cerebral palsy took part in this study, of which 101 mothers reported anaemia in early pregnancy. The infants with cerebral palsy were compared to infants of a similar age, who were recruited through random sampling of the Births registry. They enrolled 2 comparison infants to every 1 infant who had cerebral palsy. Comparison infants were eligible if they were born without any birth defects and were conceived within 3 days of the date of birth for children with cerebral palsy. Of the comparison group of infants, 50 mothers reported anemia in early pregnancy. n the study above, which of the following would the Odds Ratio (OR) be equal to? Group of answer choices Incidence Rate Ratio (IRR) Risk Difference (RD) Prevalence of cerebral palsy Incidence of cerebral palsy

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RESUBMIT QUESTION

I and II are correct I and III are correct Only III is correct All the alternatives are correct

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AWAITING AN EDUCATOR

Which of the following statements is a correct interpretation of a p value? Group of answer choices P = 0.05 means there is only a 5% chance that the null hypothesis is true P = 0.05 means there is 5% chance of Type 1 error P < 0.05 means you have proved your hypothesis None of these responses is correct

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ANSWERED

Asma Venkitta verified

Numerade educator

Income, an indicator of socioeconomic position, was one of the potential confounders in a study assessing the effect of physical activity on cardiovascular disease. Please select why income was considered to be a potential confounder: ncome is on the causal path between physical activity and cardiovascular disease Individuals with a higher income are more likely to practice physical activity and have less cardiovascular disease Income is strongly associated with physical activity Income is strongly associated with cardiovascular disease

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