how to compare the survival rates between the two groups at a specific time point

Denali — Thu, 16 Apr 2020 19:01:10 GMT

Do you know how to compare the survival rates between the two groups at a specific time point?

From the Kaplan Meier plot I made, at year 5, survival rate in patients with AKI is 52.25% and 45.78% in patients without AKI. Is there a specific way to test if the survival rates are significantly different between the two groups at year 5?

Below is my code:

/* K-M Curve for All Patients*/

ods graphics on / width = 6 in height = in border = off ;
ods graphics on/ imagefmt = tiff imagename = "Figure_AKI" reset = index;
ods listing image_dpi = 300 style = axis_wall style=StatColor;

proc lifetest data=one_a plots=survival(test atrisk =0 to 15 by 2.5)
/* ods select SurvivalPlot;*/
outsur=survival2;
time Survive_year*death(0);
label Survive_year='Time (Years)';
/*title 'Time to Death'*/;
strata AKI;
ods output SurvivalPlot = graph;
run;
ods graphics off;

Re: how to compare the survival rates between the two groups at a specific time point

cminard — Thu, 16 Apr 2020 23:37:11 GMT

That's not really the purpose of KM curves. In time-to-event analysis, the outcome measure is TIME to event. Not the % of subjects with event. If you want to compare % of subjects who survive to 5-years, then you cannot have any censored observations through 5-years, and then you can use chi-square or Fisher exact test.

topic Re: how to compare the survival rates between the two groups at a specific time point in SAS Programming

how to compare the survival rates between the two groups at a specific time point

Re: how to compare the survival rates between the two groups at a specific time point