As a beer drinker you predict that among other beer drinkers, drinking Coors mig

Question

As a beer drinker you predict that among other beer drinkers, drinking Coors might be associated with mortality from cirrhosis than other brands. You do a case-sontrol study in which beer drinkers wo recently died of alcohol related cirrhosis were compared to control cirrhotic patients who are surviving. Your study finds that 60% alcohol related deaths due to alcohol related cirrhosis were long term Bud drinkers vs.15% of control patients who were Bud drinkers.

1. What biases might come into play in this study?

2. According to these data how many times does a Bud drinker increase the risk of death due to cirrhosis. Is this a RR or OR?

Explanation / Answer

1) This is a case control study. So, biases that can occur in this study design includes selection bias, recall bias, observer bias and confounding bias.

2) This is a case control study. So, the risk is calculated in odds ratio.

The formula for odds ratio is ad/bc

= (60×85)/(15×40)

= 5100/600

= 8.5

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