Dear Colleagues
Happy holidays
I have done a survival analysis Kaplan meier curves with at risk table reported
I have attached the at risk table to this message
However, when I calculate the number of events at 5 years period,
I find that number of events in the no-induction group is (38 out of 740 patient)
And in the induction group is 110 out of 2860 patients.
My questions are:
-Why there is a discrepancy between number of events in each group and the at risk table??
-How can I calculate the 5 years incidence in each group? Is there a way on stata to calculate this?
Can I just divide the number of events in 5 years by the total number of patients in the group to get the incidence?
N.B there is no loss to follow up in any of the groups
Thank you very much for your support
Looking forward to hearing back from you
The risk set reduces at any time when either event happened or the individual censored. According to your risk table and reported data, it looks like that along with happening of event, risk set is also decreasing. Reason for censoring the risk set is not only the lost to follow up. It may that your study has completed but the event not happened to all so some of the individual with varying follow-up, could not experience the event. For example your study completed in Jan 2020, the person who recruited in Jan 2018, Jan 2019 and Aug 2019 who have not experience any event has follow-up of 2 year, 1 year and 0.5 year without any event, i.e., censoring. It is the reason of discrepancy between risk table and events.
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