Title: Survival analysis - specifying age as time
Greetings,
My apologies for a rather simple question.....
I am evaluating the effectiveness of an intervention on the incidence of occupational noise-induced hearing loss.
I am conducting a survival analysis, in which I wish to examine time-to-hearing-loss in my experimental vs. control groups. My hypothesis is that time-to-hearing loss will be longer in the experimental group.
Because age is major risk factor for hearing loss, I wish to use age as my “time” variable.
However, subjects only become at risk after they have had their first exposure to noise. Therefore I have entered individuals age-at-first-exposure as their origin:
