Help with proc phreg in SAS

[cecypdel]

I need to know how to interpret the analysis of maximum likelihood estimates output in SAS after using a phrec procedure with backwards selection.

Here is an example output.

The code looks something like this:

proc phreg data="map.sas7bdat";

model survival*censor(1) = After_Blood_Return __hr_After_60_Blood_Loss After_60_Blood_Loss _0_min_After_40_Blood_Loss After_40_Blood_Loss Before_Hypotension

/selection=backward;

run;