Advertisement
The Body: The Complete HIV/AIDS Resource
Follow Us Follow Us on Facebook Follow Us on Twitter Download Our App
Professionals >> Visit The Body PROThe Body en Espanol
Read Now: Expert Opinions on HIV Cure Research
   
Ask the Experts About

Choosing Your MedsChoosing Your Meds
           
Rollover images to visit our other forums!
Recent AnswersAsk a Question
  
  • Email Email
  • Glossary Glossary


100 person years????
Feb 9, 2003

Dr. Wohl, I read many reports that use statistical numbers I'm not familiar with. For example, 1.1 sero-conversions per 100 person years. What exactly does this mean? Is it 100 persons or something else?

Response from Dr. Wohl

What is being reported here is an incidence rate. This is used to look at new cases of whatever you are interested in when there are varying periods of observation in the group being studied. For instance some people in the group are followed for longer period and some shorter periods. The number of new cases is described as being per the total person time at risk.

So in the example you gave, there were 1.1 new HIV cases in per 100 years that the group members added together were at risk.

Another way to think about this would be if you looked at a group of motorists to see how many accidents occurred during study. You can count the accidents and express this per motorist but that ignores the fact that different drivers drove far and some very little. Better would be to see how many accidents occurred per mile driven. This could be 1.1 accidents for every 100 miles a person drove.

If there are any epidemiologists out there, please feel free to elaborate and/or correct. DW



Previous
question regarding total Serum protein and hiv
Next
Where do you see it

  
  • Email Email
  • Glossary Glossary

 Get Email Notifications When This Forum Updates or Subscribe With RSS


 
Advertisement



Q&A TERMS OF USE

This forum is designed for educational purposes only, and experts are not rendering medical, mental health, legal or other professional advice or services. If you have or suspect you may have a medical, mental health, legal or other problem that requires advice, consult your own caregiver, attorney or other qualified professional.

Experts appearing on this page are independent and are solely responsible for editing and fact-checking their material. Neither TheBody.com nor any advertiser is the publisher or speaker of posted visitors' questions or the experts' material.

Review our complete terms of use and copyright notice.

Powered by ExpertViewpoint

Advertisement