[RAT Patrol]

less than one chance in a hundred over an extended period of time.

No, Madg, I think that's PER YEAR. It is not possible that they mean to stretch the risk ratio out over 100 years. Most people don't even live that long. It is just a way of calculating your risk over time. I think this study says you have approx. a one percent chance PER YEAR of getting the disease. If your years of risk increases, then your total risk increases.

I'll get back to you when I have time to find the facts on time versus risk factor.

[eastsider]

Whether "person hours" means a year, a century or a millennium, person hours will alter the effectiveness ratio only to the extent that it alters the number of HIV transmissions in either group. Presumably, the greater the number of person hours in the study, the more reliable the data.