A) A study is conducted to assess the relationship between theuse of marijuana during pregnancy and adverse delivery outcomes,defined as major congenital malformations. The following variablesare used in the analysis.
Delivery outcome: major congenital malformation versus otherdelivery.
Risk factors:
1. Marijuana usage during pregnancy: yes or no
2. Race: White or non-white
3. SES categorized as: low, middle, or high
4. Maternal age
5. Any previous stillbirth: yes or no
a) Write down a model to evaluate this relationship includingterms in the model for the confounding factors and interactionsbetween marijuana usage and each of the other factors. Be sure tostate the coding scheme you are using to represent the variables inthe model.
b) Write down the odds ratio corresponding to the model in part(a) for the odds of malformation given marijuana usage relative tothe odds of malformation given no usage.
