I have a dataset of 1500 patients for a time-to-event study. Almost half the population died at the moment of inclusion into the study which means that they have had a follow-up time of zero. Now I want to report the follow-up time which is around 5 days while the surviving patients were followed up for several years.
Is that a problem that needs solving? I have a feeling that this is not representative of my study population. I have looked at the reverse-kaplan-meier method but I dont know if that is applicable to my current situation.