Hi,

I am trying to estimate the hazard ratios of the age of first drinking, the goal is to measure the risks of underage drinking (<18 years). The values for age at first drinking are: 0 (never), 12,13, 14...38.

I can run the analysis as it is, but certainly not doing it right because I didn't specify the cut-off age anywhere. I am following a similar study that mentioned: "The outcome variable is the age at first drinking. For teens with no drinking experience at survey time, the age at interview was used to include them in the analysis (i.e., censor under the terminology of survival analysis)."

Please free free to share your insights on this, or link to any material that can teach the method.

Thank you.