You are performing a case-control study dealing with the development of skin can

Question

You are performing a case-control study dealing with the development of skin cancer in people who are exposed to more than 4 hours of direct sun per day versus those exposed to less than 4 hours of sun per day. After collecting information and conducting interviews, you gather your data and generate the following chart:

a. Calculate the odds ratio.
b.Does the odds ratio you calculated in (a) suggest that those people exposed to direct sunlight for more than 4 hours per day are more or less likely to develop skin cancer? Why?
c. Name at least one confounding variable that might impact these results.
d.What is one way to ensure that the difference between the two groups is actually due to the health problem examined in this study?

Exposure to Direct Sunlight (per day) Contracted Skin Cancer Do Not Have Skin Cancer Minimal (less than 4 hours) 15 70 More than 4 hours 60 30

Explanation / Answer

a.ratio calculation: 15:70=15/5:70/5=3:14

60:30=60/30:30/30=2:1

b,c.According to the ratio ,those people who are exposed to direct sunlight for more than 4hours have more chances of getting affected with skin cancer.UV radiation present in the sunlight is an environmental human carcinogen.UV rays majorly affects the skin of human.It causes sunburn inflammation,erythma,tanning,local and systematic immunosuppression.

d.The only way to ensure that tha difference between the two groups is only by the symtoms caused by the affected patients and non affected patients.

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