. State the advantages thata prospective cohort study would offer as opposed to a cross-sectional study.
Calculate OR and RR with p-values and 95% Confidence Intervals for showing the association between
arsenic exposure in childhood and post-adolescence ADHD among the study participants. Use SPSS to
compute OR and RR
Do you see any change in OR when you take the two confounding variables maternal education and sex (boys
vs girls) into account at the same time while computing OR? How much is the change? Show the adjusted OR,
corresponding p-value, and 95% CI. What is the objective of calculating adjusted OR for the relationship
between arsenic exposure in childhood and post-adolescence ADHD?
Using variables that are listed in the SPSS datafile as examples, state three potential sources of the following
random errors (give just one example for each of the following random errors):
Variability in measurement
Do boys and girls differ significantly for the following health outcomes? Conduct independent sample t-tests
and state your findings (you can copy the results from SPSS).
Body Mass Index (BMI) – show unit in the results
TPO Antibody – show unit in the results
Neurobehavioral test TAP preferred
What external validity issue do you see in the Bangladesh Adolescent study (hints: internal or external validity