A group of researchers is interested in whether a new formulation...

A group of researchers is interested in whether a new formulation of vaginal microbicide for HIV prevention is effective. They recruit 4,000 cisgender women, transgender men, and nonbinary people with vaginas who have male sex partner(s) for the study. In the absence of an approved, effective vaginal microbicide for HIV prevention, the control arm participants will receive a placebo, which is a water-based lubricant. All participants were found to be HIV-negative at enrollment. 2,000 participants receive the treatment and 2,000 receive placebo. After enrollment and randomization, participants are followed for six months and are tested for HIV again at the end of the study. Among those who receive the treatment, 37 test positive for HIV at the end of the study. Among those who received the placebo, 52 test positive for HIV at the end of the study. What is the study design? Group of answer choices Cohort study Cross-sectional study Randomized control trial Case-control study Case series What is the exposure? Group of answer choices Oral PrEP Vaginal microbicide PrEP Water-based lubricant HIV acquisition during follow up HIV infection at enrollment What is the outcome? Group of answer choices Oral PrEP Vaginal microbicide PrEP Water-based lubricant HIV acquisition during follow up HIV infection at enrollment Which measure of association is most appropriate to compare study outcomes? Group of answer choices Relative Risk (RR) Odds Ratio (OR) Prevalence Ratio (PR) Please fill out the 2x2 table to set up calculating the measure of association. Outcome yes Outcome no Exposed Unexposed