compare survival at a specific time point

#1
Hi! I have to compare the 2 years disease free survival of two groups of patients and obtain a p-value... with Kaplan-meier curves and time tables I can have the "value" of the 2 years disease free survival, but I can compare only the mean o median survival, not the survival at a specific time point. Any idea to do it with SPSS?
Thank you!
 
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