Relative risk and risk ratios

The video tutorial explains cohort studies, focusing on calculating disease risk and comparing risks between smokers and non-smokers. It covers interpreting risk ratios, understanding excess and attributable risks, and provides a real-world example of smoking's impact on birth weight. The tutorial emphasizes the importance of understanding risk differences and ratios in epidemiological studies.

Explain the concept of excess risk or attributable risk as discussed in the text.

What was the outcome of the cohort study regarding smoking during pregnancy and low birth weight?

How is the risk of low birth weight calculated for both smokers and non-smokers?