Association between dietary supplements and cognitive ability among children

Researchers conduct a prospective cohort study to assess the association between dietary supplements and cognitive ability among children. A total of 500 children age 12-17 years who take an omega-3 fatty acid supplement are compared with 500 children age 12-17 years who do not take an omega-3 fatty acid supplement. Researchers follow the children for 2 years. During this time, 300 children who take the supplement earn what is classified as a “high” score on a cognitive test while 200 children who do not take the supplement earn what is classified as a “high” score on the same cognitive test.

1. What is the risk difference between the exposed and unexposed groups?

2. What is the risk ratio between the exposed and unexposed groups?

3. What is the cumulative incidence of depression in the high-stress group?

4. What is the cumulative incidence of depression in the low-stress group?

5. What is the rate difference between the high-stress and low-stress groups?

6. What is the rate ratio between the high-stress and low-stress groups?

pleas answer it in 15 m thx 

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