Vs.

1 You start your study with a cohort of 400 babies born in 2015. At baseline none of them have any symptoms of lead poisoning, but after taking environmental samples from their homes you find that 250 of them have lead paint exposure and 150 of them do not. You follow them for 10 years and keep track of incident cases of lead poisoning based on blood samples. In 2025 you end your study and report the following: 100 of the children previously exposed to lead paint in 2015 have lead poisoning and 25 of the children that were not exposed in 2015 have lead poisoning.

Answer questions a-c below:

a)Calculate the cumulative incidence for the exposed group.

b)Calculate the cumulative incidence for the unexposed group.

c)Calculate the relative risk between lead paint exposure and lead poisoning.