Suppose researchers were interested in determining the relationship, if any, between the use of cell phones and the incidence

6 answers
Question:

Suppose researchers were interested in determining the relationship, if any, between the use of cell phones and the incidence of brain cancer. Would it be better to use a randomized experiment, a case–control study, or an observational study that did not use cases and controls? Explain.

Answers

a. Odds ratio = 1.58

b.  Inasmuch the odds ratio is greater than 1, this means that higher odds of melanoma exist in people exposed to indoor tanning, than in those not exposed to indoor tanning

Explanation:

For case  study                                                  

Let 'a'  represent the total population of people with melanomia = 696                                                      

Let 'b' represent the total number of people with melanomia exposed to indoor tanning  =  1107 – 696 = 411 people

For  control study

Let 'c' represent the total population = 1500

Let 'd' represent the total number of people not exposed to indoor tanning = 1500 - (0.428 * 1500)

                                                          =  1500 - 723

Total number of people not exposed to indoor tanning   = 777 people

                                                       

a. Odds ratio = (a/b) / (d/c) = (696/411) / (777/723)

                                                = 1.69 / 1.07 = 1.58

b. Inasmuch the odds ratio is greater than 1, this means that higher odds of melanoma exist in people exposed to indoor tanning, than in those not exposed to indoor tanning.

A case-control study is designed to help determine if an exposure is associated with an outcome (i.e., disease or condition of interest).

Step-by-step explanation:

A study that compares two groups of people: those with the disease or condition under study (cases) and a very similar group of people who do not have the disease or condition (controls). Researchers study the medical and lifestyle histories of the people in each group to learn what factors may be associated with the disease or condition. For example, one group may have been exposed to a particular substance that the other was not. Also called retrospective study.

Step-by-step explanation:

This isnt a question

Explanation:

It just isnt

True

Explanation:

It is true that incident cases are typically preferred over prevalence cases for use in case control studies because they reduce the chance of recall bias and over representation of cases with long duration of disease, which is a typical feature of the prevalence cases.

To be effective, case study should be observational, methodical and careful assessment under a control environment. Given its characteristics, case study is not one to be prolonged for the phenomenon under study to occur.

Thus, incident cases have these advantages over the prevalence cases.

Food prices

Food labeling

Biosecurity of food

Food weigh

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