Question

joana is investigating the relationship between coronary heart disease and smoking. She works in the hospital and selects 100 people with coronary heart disease. From the same hospital, she matches 100 other patients from the General Medicine department of similar backgrounds and demographics. She then utilizes a questionnaire to collect responses related to smoking, drinking alcohol, physical activity, and weight loss attempts, among other variables. Of the 100 people with coronary heart disease, 58 of them are smokers. Of those without coronary heart disease, 12 of them are smokers.

Calculate the Odds Ratio. show work and then Interpret the Odds Ratio that you calculated.

What type of study design is this?

Answer 1

ODD'S ratio is used In CASE-CONTROL STUDY which is atype of observational study.

CALCULATING Odd's ratio

TABLE

	DISEASED (Coronary artery disease)	HEALTHY
EXPOSED(SMOKER)	58(a)	12(b)
NON-EXPOSED(NON-SMOKER)	42(c)	88(d)
TOTAL	100	100

I have given alphabetic figures to make calculation easy, it is as following

a - diseases with exposure

b - healthy with exposure

c - diseased without any exposure

d - healthy without any exposure

Odd's ratio = ad/bc = 58 x 88 / 42 x 12 = 5104/1764 = 2.89

Odds ratio is 2.89