Question

An epidemiological study in Baltimore, MD tested men for HIV over the course of three years. The group of men being studied were tested six months prior to the study's start date. All men tested negative at the time of the study's start date. The study included 350 men. Six men were diagnosed with HIV throughout the course of the study. What is the incidence of HIV in this population?

Answer 1

To find the incidence of HIV in this population, we have to divide the newly infected men with HIV by the population not infected at the start of the study

We know that, total non infected population at the beginning of the study = 350

Number of newly infected people = 6

Therefore the incidence of HIV in this population = 6 / 350 or 6 people per 350.

The figure can either describe a proportion or a percentage

For calculating in percentage, we will divide the proportion by 100 , so we get 6/350 x 100 = 1.71428571 % or 1.71% approx.