A study was done on how often men and women who attend gyms

A study was done on how often men and women who attend gyms contract a fungal infection. Over a two-month period, 5 out of 100 men reported that they had contracted a fungal infection, while 50 out of 250 women reported having contracted a fungal infection. What is the relative risk of women to contract a fungal infection as compared to men? 0.5 2. 2.5 0.25 4 A four year study was conducted in a home for the elderly to determine the incidence ulcers caused by Helicobactor pylori. At the beginning of the study, the home housed residents amongst which two were being treated for ulcers. By the end of the first year two new people had ulcers. At the end of the second year residents left the residence. 12 new residents moved in the beginning of the third year. By the end of the third year three residents died. At the end of the fourth year five people had ulcers. What is the number of person-years of the study? 389 person-years 387 person-years 378 person-years 392 person-years 401 person-years

Solution

I) The comparison of Fungal Infection among the Women and Mens in a gym study shows us that amongst the men there is 1 person out of 20 who is getting infected, while among the women the infection rate is 1 out of 5 people. So the relative risk of women to contact a fungal infection as compared to men is 5:20- is 0.25. Here the answer is option D.

II) Person time estimate is done through a calculation. This a mesure where we combine the number of persons and their time contribution in a study. The formula to calculate the person-year estimate is

[ (number of people at risk at the begining of the time interval + number of people at the end of the time interval) / 2] * (Number of units in the time interval).

Here it would be [ ( 100 Residents at the begining of the study + no of people at the end of the study) / 2] * 4 year time period.