p values for hazard ratios

[msarin]

Using a Cox multivariate proportional hazard model in SAS, how does one get the p values for the revision risk (not the p values for the coefficients)?  Below are fake data:

Variable                                 Revision Risk             p value        

Age group in years             

35-49 vs. 18-34                0.637 (0.200-2.026)    

50-59 vs. 18-34               1.229 (0.883-1.711)    

60-69 vs. 18-34               1.076 (0.794-1.458)    

>=70 vs. 18-34               1.444 (1.079-1.933)

[msarin]

Actually, I ended up doing this:

* Calculate p value for hazard ratio;
%macro hazard_p;
est=log(hazardratio);
l=log(HRLowerCL);
u=log(HRUpperCL);
SE=(u-l)/(2*1.96);
z=abs(est/SE);
p=exp(-.717*z-.416*z**2);
drop est--z;
%mend hazard_p;