Question

question completion Status: QUESTION 1 2 points We want to test the effectiveness of a pre-exposure prophylaxis (PrEP). Participants are given the pill or not. Each person meets with the researchers once a year for 3 years to check their HIV status. This might be an example of which study design RCT Cross-sectional study Prospective cohort study Case-control study QUESTION 2 The cross products ratio closely approximates the relative risk for case-control studies and cohort studies True False 2 points QUESTION 3 In a population of 50,000 people, 20 have disease X and 5 people die from disease X. In order to calculate the attack rate, we should divide 5 by20 True False Click Save and Submit to save and submit. Click Save All Answers to save all answers

Answer 1

1. We want to test the effectiveness of pre-exposure prophylaxis, Participants are given to pill or not, each person meets researchers once a month to check their HIV status.

This is an example of RCT (Randomize control trail) because there is an experiment on the effectiveness of pre-exposure prophylaxis of HIV

Answer - RCT

2.

The cross-product ratio closely approximates the relative risk for case-control studies and cohort studies

(False)

Cross product ratio is otherwise known as the odds ratio, Relative risk is a different thing and we also can't calculate relative risk in Case-control study.

3.

In the population of 50,000 people. 20 have disease X and 5 people died. In order to calculate the attack rate, we have to divide the total number of exposed people with diseased people, because attack rate is a calculation of morbidity.

Answer - (False)