Programming the statistical procedures from SAS

95% CI of KM quartile estimates

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95% CI of KM quartile estimates

Hi,

I have a question about SAS output of proc lifetest. I am not sure about what ' [Lower Upper) ' means. Does it mean the 95% CI includes lower bound, but not upper bound? So in the following example, the 95% CI of median time goes from 13.8305 (included) to less than 15.0131 (excluded)?

                   Quartile Estimates

Percent    Point            95% Confidence Interval

               Estimate               [Lower Upper)             

    

Thanks for your help!

           

   75      18.8896           16.8200    19.9409

   50      14.2904           13.8305    15.0131

   25      12.2208           11.7608    12.7792

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