Question

Questions 6-10 refer to a hypothetical case-control study of examining the relationship between end-stage renal disease (ESRD) and electronic cigarettes (e-cig) smoking. ESRD cases No ESRD E-cigarette use 240 240 600 800 Total 440 840 Fill in the revised cells (show the values for a, b, c, d as part of your answer) due to misclassification and calculate the OR for the scenario in Question 9. Compare the OR with the OR obtained from Question 6 in one or two sentences ESRD cases No ESRD Total E-cigarette use Total 440 840 HTML Editor Paragraph- 0.4 240 (1-0.6)200 176 b 0.6 240(1-0.8)600 264 c (1-0.4)2400.6'200 264 d (1-0.6)240+0.8 600 576 Misclassified OR-(176.576)/ (264.264)-1.45

This is for my epidemiology class. I already did the work. In here, we are talking about differential misclassification. My question is, how do I interpret my results? The true OR = 3.00 and the misclassified OR (the work I did) = 1.45. How can I interpret these OR results? Thank you.

Answer 1

This is the analytical type of epidemiology.

Construction of 2x2 table as below

	ESRD cases	No ESRD	Total
E-cigarette use	240(a)	240(b)	480
No use	200(c)	600(d)	800
Total	440	840	1280

OR means Odd Ratio. It is calculated by using the formula

OR=ad/bc.

Here

a=240

b=240

c=200

d=600

OR= 240×600/240×200

OR=3.

So you will get True OR if you calculated shown above