Cohort study design question.

Hi there, here are the details.

Study the association between parental knowledge of lead poisoning disease prevention practices and the incidence of lead poisoning among their children

Intervention: 1 year
Participants: 60

Program components; All participants attend 4 educational classes teaching 4 different skills to modify risk factors.


1.Can the intervention be tested as a whole? I mean all 4 different risk factors will change along with incidence rates.
2. Do I need to test each factor separately to see the association with disease incidence?

Thank you so much.
Measured by blood test on children every 3 months.
Families will take tests after each class to evaluate knowledge attained.

So I am studying the causal relation of the blood lead levels and the family's level of knowledge.
Chose a cohort study using a correlation test.